Source:http://linkedlifedata.com/resource/umls/id/C0021067
CSP: immunocytochemical methods using antibody coupled to the enzyme peroxidase to stain tissue constituents.,NCI: An immunological procedure in which antibodies are coupled with a peroxidase molecule. Following localization via the antibody, the peroxidase is reacted with a corresponding substrate to produce a product which can be seen with a light microscope.