[ noun ] (medicine,immunology,pharmacology) any substance (as a toxin or enzyme) that stimulates the production of antibodies
Used in print(A. N. Nagaraj and L. M. Black, "Localization of...)
However , the nonspecific staining by the * * f in tumor sections was considered bright enough to be confused with the staining of small amounts of WTV antigen .
The specificity of staining in WTV tumors with * * f and * * f but not with NS and * * f or with antiserum to potato_yellow-dwarf_virus and * * f , and the absence of such staining in crown_gall tumor tissue from sweet-clover , indicate that an antigen of WTV was being stained .
Results of specific staining by the direct and the indirect methods were similar and showed the localization of WTV antigen in certain tissues of tumors .
The virus antigen was concentrated in the pseudophloem tissue .
Within the pseudophloem cells the distribution of WTV antigen was irregular in the cytoplasm .