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RABBIT IgG ANTI-SARS-COV-2 SPIKE (S1) POLYCLONAL ANTIBODY SARS-CoV-2 Spike (S1) polyclonal antibody is an antibody that recognizes the SARS-CoV-2 Spike glycoprotein, subunit 1 (S1) and is suitable...

RABBIT IgG ANTI-SARS-COV-2 SPIKE (S2) POLYCLONAL ANTIBODY SARS-CoV-2 Spike (S2) polyclonal antibody is an antibody that recognizes the SARS-CoV-2 Spike glycoprotein, subunit 2 (S2) and is suitable...

RECOMBINANT AUTOGRAPHA CALIFORNICA MULTIPLE NUCLEOPOLYHEDROVIRUS, LYSATE Recombinant AcMNPV baculovirus lysate contains inactivated recombinant Autographa californica multiple nucleopolyhedrovirus...

RECOMBINANT CAT IgE-FC DOMAIN Recombinant cat IgE-Fc domain, a cat immunoglobulin epsilon heavy chain constant region (IgE-Fc), manufactured in mammalian cells. Recommended as an immunogen to...

RECOMBINANT DOG IgE-FC DOMAIN Recombinant dog IgE-Fc domain, a dog immunoglobulin epsilon heavy chain constant region (IgE-Fc), manufactured in mammalian cells. Recommended as an immunogen to...

RECOMBINANT HORSE IgE-FC DOMAIN Recombinant horse IgE-Fc domain, a horse immunoglobulin epsilon heavy chain constant region (IgE-Fc), manufactured in mammalian cells. Recommended as an immunogen to...

RECOMBINANT HUMAN IgE KAPPA L Recombinant human IgE (kappa L) protein is a recombinant human IgE antibody with a kappa light chain which recognises Zika virus NS1. It is recommended for use as a...

RECOMBINANT HUMAN IgE-FC DOMAIN Recombinant human IgE-Fc domain, a human immunoglobulin epsilon heavy chain constant region (IgE-Fc), manufactured in mammalian cells. Recommended as an immunogen to...

RECOMBINANT MOUSE IgE-FC DOMAIN Recombinant mouse IgE-Fc domain, a mouse immunoglobulin epsilon heavy chain constant region (IgE-Fc), manufactured in mammalian cells. Recommended as an immunogen to...

RESPIRATORY SYNCYTIAL VIRUS A GLYCOPROTEIN G (RSV A gG) This Human RSV (A) glycoprotein G comprises His 67 – Arg 297 (Accession # P20895) from the Long strain, and is fused with a polyhistidine tag...

RESPIRATORY SYNCYTIAL VIRUS A GLYCOPROTEIN G, HUMAN FC-TAG This Human RSV (A) glycoprotein G comprises amino acids 67-298 of the major glycoprotein of RSV and contains a C-terminal human IgG1 Fc-tag...

RESPIRATORY SYNCYTIAL VIRUS A GLYCOPROTEIN G, MOUSE FC-TAG This Human RSV (A) glycoprotein G comprises amino acids 67-298 of the major glycoprotein of RSV. It contains a C-terminal mouse IgG2a Fc-tag...

RESPIRATORY SYNCYTIAL VIRUS A LYSATE Respiratory Syncytial Virus A Lysate is purified from Vero cells using sucrose density gradient ultracentrifugation, disrupted in the presence of  detergent...

RESPIRATORY SYNCYTIAL VIRUS B LYSATE Respiratory Syncytial Virus B Lysate is purified from Vero cells using sucrose density gradient ultracentrifugation, disrupted in the presence of  detergent...

RHINOVIRUS TYPE 1A LYSATE Rhinovirus type 1A lysate produced from MRC-5 or HeLa cells. Purified using sucrose density gradient ultracentrifugation, heat-inactivated and tested for absence of viral...

RIFT VALLEY FEVER VIRUS NUCLEOPROTEIN Rift Valley Fever Virus Nucleoprotein has been manufactured in response to the unmet need for highly purified, concentrated protein for use in serological based...

ROSS RIVER VIRUS RECOMBINANT ANTIGEN Ross River virus recombinant protein is a structural polyprotein, a recombinant preparation containing virus-like particles and aggregates thereof produced in...

ROTAVIRUS VP7 PROTEIN, SHEEP FC-TAG Rotavirus VP7 protein is expressed in HEK293 cells and purified from culture supernatant by Protein G and ion exchange chromatography.   PRODUCT DETAILS...

RPE-IGG CONJUGATION KIT The RPE-IgG conjugation kit utilizes a novel chemistry to generate highly reproducible IgG-RPE conjugates with a simple procedure. The resulting conjugates have been shown to...

RUBELLA VIRUS IGM CAPTURE ELISA This Rubella Virus IgM capture ELISA is for the qualitative determination of IgM-class antibodies against Rubella Virus in human serum or plasma. The qualitative...

RUBELLA SPIKE GLYCOPROTEIN E1 (STRAIN F-THERIEN) Rubella spike glycoprotein E1 is produced by recombinant expression of Rubella structural polyprotein (amino acids 583-1025, NCBI Accession...

RUBELLA VIRUS IGG AVIDITY ELISA Rubella Virus IgG Avidity immunoassay for the determination of Rubella-specific IgG avidity in human serum or plasma to differentiate between acute and past infection...

RUBELLA VIRUS IGG ELISA This Rubella Virus IgG ELISA is intended for the quantitative determination of IgG class antibodies against Rubella Virus in human serum or plasma (citrate, heparin)...

RUBELLA VIRUS NUCLEOPROTEIN (STRAIN F-THERIEN) Rubella Virus Nucleoprotein is produced by recombinant expression of Rubella structural polyprotein (amino acids 1-300, NCBI accession number...

RUBELLA VIRUS VLP Rubella virus-like particles are produced by recombinant expression of Rubella structural polyprotein (amino acids 1-1063, Uniprot accession number NP_062884.1) in HEK293 cells...

SAINT LOUIS ENCEPHALITIS VIRUS NS1 PROTEIN This is a recombinant Saint Louis encephalitis virus NS1 protein produced in HEK293 cells. The protein contains a C-terminal 6x His-tag. Saint Louis...

SALMONELLA TYPHI HEMOLYSIN E PROTEIN Salmonella typhi Hemolysin E protein is a recombinant antigen manufactured in E. coli cells for immunoassay development and other applications.   PRODUCT...

SALMONELLA TYPHI OUTER MEMBRANE PROTEIN (OMP) Salmonella typhi Outer Membrane Protein (OMP) is a recombinant antigen manufactured in E. coli cells for immunoassay development and other applications...

SARS CORONAVIRUS ENVELOPE PROTEIN (E. COLI) SARS Coronavirus Envelope Protein is a recombinant antigen which contains the N-terminus (1-76 amino acids) of the Envelope protein immunodominant regions...

SARS CORONAVIRUS MEMBRANE PROTEIN (MATRIX) SARS Coronavirus Membrane Protein (Matrix) is a recombinant protein (also known as E1 glycoprotein or Matrix) manufactured in E. coli. Protein contains...

SARS CORONAVIRUS NUCLEOPROTEIN (C-TERM) SARS Coronavirus Nucleoprotein (C-Term) is a recombinant protein (also known as the nucleocapsid core antigen) comprising amino acids 340-390 immunodominant...

SARS CORONAVIRUS NUCLEOPROTEIN (N-TERM) SARS Coronavirus Nucleoprotein (N-Term) is a recombinant protein (also known as the nucleocapsid core antigen) comprising amino acids 1-49 immunodominant...

SARS CORONAVIRUS NUCLEOPROTEIN, HIS-TAG (HEK293) SARS Coronavirus Nucleoprotein (N) is a recombinant antigen manufactured to high purity in mammalian HEK293 cells.   PRODUCT DETAILS – SARS...

SARS CORONAVIRUS SPIKE GLYCOPROTEIN MOSAIC SARS Coronavirus Spike Glycoprotein Mosaic is a recombinant antigen which contains amino acids 408-470 and 540-573 of the Spike protein immunodominant...

SARS CORONAVIRUS SPIKE GLYCOPROTEIN MOSAIC (N-TERM) SARS Coronavirus Spike Glycoprotein Mosaic (N-term) is a recombinant antigen which contains the N-terminal section of the Spike protein 1-53,...

SARS CORONAVIRUS SPIKE GLYCOPROTEIN (S1) SARS Coronavirus Spike Glycoprotein subunit 1 (S1) is a recombinant antigen manufactured in mammalian HEK293 cells, to greater than 95% purity.   PRODUCT...

SARS CORONAVIRUS SPIKE GLYCOPROTEIN MOSAIC (C-TERM) SARS Coronavirus Spike Glycoprotein Mosaic (C-term) is a recombinant protein manufactured in E. coli. Contains the C-terminal section of the Spike...

SARS-COV-2 (A222V MUTANT) SPIKE GLYCOPROTEIN (S1), SHEEP FC-TAG (HEK293) SARS-CoV-2 Spike protein S1 containing A222V amino acid change. Increased transmissibility of the B.1.177 lineage may be...

SARS-COV-2 (B.1.1.28) SPIKE GLYCOPROTEIN (S1) RBD, HIS-TAG (HEK293) SARS-CoV-2 (B.1.1.28) RBD mutant from Brazilian variant. Contains amino acid changes K417T, E484K, N501Y relative to Wuhan Hu-1...

SARS-CoV-2 (B.1.1.529/Omicron) Spike Glycoprotein (S1) RBD, His-Tag (HEK293) | REC32007 from is available for delivery. SARS-CoV-2 (B.1.1.529/Omicron) Spike RBD (receptor binding domain) protein...

SARS-CoV-2 (B.1.1.529/Omicron) Spike Glycoprotein (S1), His-Tag (CHO) | REC32009 from is available for delivery. SARS-CoV-2 Omicron Spike (CHO) protein. Recombinant SARS-CoV-2 Spike protein S1...

SARS-CoV-2 (B.1.1.529/Omicron) Spike Glycoprotein (S1), Sheep Fc-Tag (HEK293) | REC32006 from is available for delivery. SARS-CoV-2 (B.1.1.529/Omicron) Spike subunit 1 protein. Relative to...

SARS-COV-2 (B.1.1.7) SPIKE GLYCOPROTEIN (FULL-LENGTH), HIS-TAG (HEK293) SARS-CoV-2 Spike protein that contains all amino acid changes of the “UK variant” B.1.1.7 of SARS-CoV-2: 69-70del, Y144del,...

SARS-COV-2 (B.1.617.2: L452R, T478K) SPIKE GLYCOPROTEIN (S1) RBD, HIS-TAG (HEK293) SARS-CoV-2 (B.1.617.2) RBD mutant from the Indian (Delta) variant. Contains amino acid changes L452R, T478K relative...

SARS-COV-2 (D614G MUTANT) SPIKE GLYCOPROTEIN (S1), SHEEP FC-TAG (HEK293) SARS-CoV-2 (D614G mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674...

SARS-COV-2 (D614G MUTANT) SPIKE GLYCOPROTEIN (TRIMERIC), HIS-TAG (CHO) SARS-CoV-2 (D614G mutant) trimeric spike glycoprotein is manufactured in CHO cells to high yield and purity. Protein has the...

SARS-COV-2 (E484K, D614G MUTANT) SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 (D614G, E484K mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674 of...

SARS-COV-2 (G485R, D614G MUTANT) SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 (D614G, G485R mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674 of...

SARS-COV-2 (L84I, N439K, D614G MUTANT) SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 (L84I, N439K, D614G mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids...

SARS-COV-2 (N439K MUTANT) SPIKE GLYCOPROTEIN (S1), SHEEP FC-TAG (HEK293) SARS-CoV-2 N439K mutant spike subunit 1 protein is a recombinant protein manufactured to high purity in HEK293 cells. N439K...

SARS-COV-2 (N501Y MUTANT) SPIKE GLYCOPROTEIN (S1) RBD, HIS-TAG (HEK293) SARS-CoV-2 (N501Y mutant) spike glycoprotein (S1) RBD is a recombinant antigen manufactured in HEK293 cells to high purity...

SARS-COV-2 (N501Y, D614G MUTANT) SPIKE GLYCOPROTEIN (S1), SHEEP FC-TAG (HEK293) SARS-CoV-2 (N501Y, D614G mutant) spike glycoprotein (S1) is a recombinant antigen manufactured in HEK293 cells to high...

SARS-COV-2 (S477N, D614G MUTANT) SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 (S477N, D614G mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674 of...

SARS-COV-2 (V445I, E583D, D614G, H655Y MUTANT) SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 (V445I, E583D, D614G, H655Y mutant) spike glycoprotein (S1) is a recombinant antigen which contains the Spike...

SARS-COV-2 3C-LIKE PROTEINASE (3CLpro), ACTIVE Active recombinant full-length SARS-CoV-2 3C-Like Proteinase (3CLpro), part of the large replicase polyprotein 1ab (S3264-Q3569), expressed in E. coli...

SARS-COV-2 MEMBRANE-ENVELOPE FUSION PROTEIN, HIS-TAG (E. COLI) SARS-CoV-2 Membrane-Envelope fusion protein is a recombinant antigen manufactured in E. coli and containing the full-length Membrane (M)...

SARS-COV-2 NEUTRALIZATION ASSAY DEVELOPMENT KIT (KERALA VARIANT RBD-ACE2) This SARS-CoV-2 Kerala Variant Neutralization Assay Development Kit (RBD-ACE2) is intended for the identification and...

SARS-COV-2 NEUTRALIZATION ASSAY DEVELOPMENT KIT (BRAZILIAN VARIANT RBD-ACE2) This SARS-CoV-2 BZ Variant Neutralization Assay Development Kit (RBD-ACE2) is intended for the identification and...

SARS-COV-2 NEUTRALIZATION ASSAY DEVELOPMENT KIT (RBD-ACE2) This SARS-CoV-2 Neutralization Assay Development Kit (RBD-ACE2) is intended for the identification and qualitative measurement of...

SARS-COV-2 NEUTRALIZATION ASSAY DEVELOPMENT KIT (SOUTH AFRICAN VARIANT RBD-ACE2) This SARS-CoV-2 SA Variant Neutralization Assay Development Kit (RBD-ACE2) is intended for the identification and...

SARS-COV-2 NEUTRALIZATION ASSAY DEVELOPMENT KIT (UNITED KINGDOM VARIANT RBD-ACE2) This SARS-CoV-2 UK Variant Neutralization Assay Development Kit (RBD-ACE2) is intended for the identification and...

SARS-COV-2 NSP1, HIS-TAG (E. COLI) SARS-CoV-2 NSP1 protein, His-tag is a recombinant viral protein expressed in E. coli. SARS-CoV-2, previously known as the 2019 Novel Coronavirus (2019-nCoV), causes...

SARS-COV-2 NSP10/NSP16 METHYLTRANSFERASE, ACTIVE SARS-CoV-2 NSP10/NSP16 methyltransferase is a full-length active recombinant protein expressed in E. coli using a C-terminal His tag. SARS-CoV-2,...

SARS-COV-2 NSP14 METHYLTRANSFERASE, ACTIVE SARS-CoV-2 NSP14 methyltransferase is an active recombinant protein expressed in E. coli using a C-terminal His tag. SARS-CoV-2, previously known as the...

SARS-COV-2 NSP7, HIS-TAG (E. COLI) SARS-CoV-2 NSP7 protein, His-tag is a recombinant full-length viral protein expressed in E. coli. SARS-CoV-2, previously known as the 2019 Novel Coronavirus...

SARS-COV-2 NSP8, HIS-TAG (E. COLI) SARS-CoV-2 NSP8 protein, His-tag is a recombinant full-length viral protein expressed in E. coli. SARS-CoV-2, previously known as the 2019 Novel Coronavirus...

SARS-COV-2 NUCLEOPROTEIN, HIS-TAG (E. COLI) SARS-CoV-2 Nucleoprotein (E. coli) is a recombinant antigen manufactured to high purity. SARS-CoV-2, previously known as the 2019 Novel Coronavirus...

SARS-COV-2 PAPAIN-LIKE PROTEASE (PLPRO), ACTIVE Recombinant SARS-CoV-2 papain-like protease (PLpro), part of the large replicase polyprotein 1ab (E1564-Y1882), expressed in E. coli cells with an...

SARS-COV-2 PURIFIED VIRAL LYSATE This virus was isolated from a patient with a respiratory illness who had returned from travel to the affected region of China and developed COVID-19 in January 2020...

SARS-COV-2 RBD-NUCLEOPROTEIN CHIMERA, HIS-TAG (CHO) SARS-CoV-2 RBD-Nucleoprotein Chimera, recombinant SAR-CoV-2 N-terminal Spike S1 RBD (319-541) fused to full-length Nucleoprotein (Nucleocapsid)...

SARS-COV-2 RNA-DEPENDANT RNA POLYMERASE (RdRp), ACTIVE Recombinant full-length SARS-CoV-2 RNA-dependent RNA polymerase (RdRp) was expressed in E. coli cells using a C-terminal His-tag and shown to be...

SARS-COV-2 SPIKE GLYCOPROTEIN (FULL-LENGTH), HIS-TAG (CHO) SARS-CoV-2 spike full-length (CHO) recombinant glycoprotein is manufactured in CHO cells to high yield and purity. The furin cleavage site...

SARS-COV-2 SPIKE GLYCOPROTEIN (S1) RBD, HIS-TAG (HEK293) SARS-CoV-2 Spike S1 RBD is a recombinant receptor-binding domain antigen, expressed in HEK293 cells and purified from culture supernatant with...

SARS-COV-2 SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 Spike S1, His-tag is a recombinant antigen which contains the Spike protein amino acids 1-674 of subunit 1. Spike S1 protein is manufactured to high...

SARS-COV-2 SPIKE GLYCOPROTEIN (S1), SHEEP FC-TAG (CHO) SARS-CoV-2 Spike Glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674 of subunit 1. Spike S1 protein is...

SARS-COV-2 SPIKE GLYCOPROTEIN (S1) SARS-CoV-2 Spike Glycoprotein (S1) is a recombinant antigen which contains the Spike protein amino acids 1-674 of subunit 1. Spike S1 protein is manufactured in...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2) (AA 1000-1200) SARS-CoV-2 Spike Glycoprotein (S2) is a recombinant antigen manufactured in E. coli and containing the Spike immunodominant region (amino acids 1000...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2) (AA 800-1000) SARS-CoV-2 Spike Glycoprotein (S2) is a recombinant antigen manufactured in E. coli and containing the Spike immunodominant region (amino acids 800 to...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2) SARS-CoV-2 Spike S2, His-tag is a recombinant antigen which contains the Spike protein amino acids 685-1211. Spike S2 subunit protein is manufactured to high yield...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2), SHEEP FC-TAG (CHO) SARS-CoV-2 Spike Glycoprotein (S2) is a recombinant antigen which contains the Spike protein amino acids 685-1211 of subunit 2. Spike S2 protein...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2) SARS-CoV-2 Spike Glycoprotein (S2) is a recombinant antigen which contains the Spike protein amino acids 685-1211 of subunit 2. Spike S2 protein is manufactured in...

SARS-COV-2 SPIKE GLYCOPROTEIN (TRIMERIC), HIS-TAG (CHO) SARS-CoV-2 trimeric spike glycoprotein is manufactured in CHO cells to high yield and purity. Protein has proline substitutions at residues 986...

SARS-COV-2 SPIKE GLYCOPROTEINS (S1), SHEEP FC-TAG (HEK293/CHO CELL DUO PACK) This SARS-CoV-2 Spike Duo Pack contains recombinant subunit 1 (S1) proteins manufactured in both human embryonic kidney...

SARS-COV-2 SPIKE GLYCOPROTEIN (S2), SHEEP FC-TAG (HEK293/CHO CELL DUO PACK) This SARS-CoV-2 Spike Duo Pack contains recombinant subunit 2 (S2) proteins manufactured in both human embryonic kidney...

SARS-COV-2 SPIKE N-TERMINAL DOMAIN (NTD), HIS-TAG (HEK293) Recombinant SARS-CoV-2 Spike protein N-terminal domain (NTD). This domain shows the lowest sequence ID compared to SARS-CoV Spike protein...

SARS-COV-2 SPIKE N-TERMINAL DOMAIN (NTD) Recombinant SARS-CoV-2 Spike protein N-terminal domain (NTD). This domain shows the lowest sequence ID compared to SARS-CoV Spike protein. The protein is...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (HL10) Recombinant Llama VHH-Human IgG Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (HL14) Recombinant Llama VHH-Human IgG Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (HL25) Recombinant Llama VHH-Human IgG Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (HL38) Recombinant Llama VHH-Human IgG Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (L14) Recombinant Llama VHH Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity validated for...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (L25) Recombinant Llama VHH Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity validated for...

SARS-COV-2 SPIKE PROTEIN NEUTRALIZING NANOBODY (L38) Recombinant Llama VHH Antibody for studying neutralization of SARS-CoV-2 and detection of Spike glycoprotein. Neutralizing activity validated for...

SARS-COV-2 SPIKE-E-M MOSAIC PROTEIN, HIS-TAG (E. COLI) SARS-CoV-2 Spike-E-M Mosaic protein is a recombinant antigen manufactured in E. coli and containing the Spike (S), Envelope (E) and Membrane (M)...

SEVERE FEVER WITH THROMBOCYTOPENIA SYNDROME VIRUS NUCLEOPROTEIN At The Native Antigen Company we have developed recombinant SFSTV Nucleoprotein, expressed in mammalian HEK293 cells. The protein...

SHEEP ANTI-CHIKUNGUNYA VIRUS Sheep anti Chikungunya virus antibody has been raised against recombinant CHIKV VLPs, expressed in mammalian cells. These VLPs are comprised of E1 and E2 envelope...

SHEEP ANTI-CMV PENTAMER Sheep anti CMV pentamer antibody has been raised against recombinant CMV gH pentameric complex, expressed in mammalian cells. The Cytomegalovirus (CMV) gH pentamer complex is...

SHEEP ANTI-EBOLA VIRUS The Native Antigen Company Sheep anti Ebola virus antibody has been raised against recombinant EBOV virus like particles (VLPs), expressed in mammalian cells. These VLPs are...

STREPTAVIDIN-FITC CONJUGATE Streptavidin-FITC conjugate is a recombinant protein purified from E. coli. It is supplied as a purified product conjugated to Fluorescein isothiocyanate (FITC). This...

STREPTAVIDIN-HRP CONJUGATE Streptavidin-HRP conjugate is a recombinant protein purified from E. coli. It is supplied as a purified product conjugated to the enzyme horseradish peroxidase (HRP). This...