A colorless substrate acted on by the enzyme portion of the ligand to produce a colored product is known as a/an _________.

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A chromogen is a colorless substrate that becomes colored when acted on by an enzyme, such as in an enzyme-linked immunosorbent assay (ELISA) or other immunoassays. Antibody is a type of protein that binds to specific antigens. Antigen is a substance that can stimulate an immune response. Serotype is a classification of microorganisms based on their surface antigens.

A Colorless Substrate Acted on by the Enzyme Portion of the Ligand