(biochemistry) In the testing of cell surface antigens, a serological specificity that is poor or broad relative to other specificities and can be defined as 2 or more split antigens.(Example: HLA-B51 and HLA-B52 are split antigens of the HLA-B5 broad antigen)

The process by which different strains of a virus or viruses combine to form a new subtype having a mixture of the surface antigens of the original strains.

(immunology) The mechanism by which an infectious organism changes its surface proteins in favor of circumventing a host immune response.

(medicine) Surface antigen of the hepatitis B virus (HBsAg).

Synonym of autoantigen

(immunology) Any of the human leukocyte antigens (HLAs) which are the determinants of histocompatibility

plural of antigenic variation

An antigen located on the surface of red blood cells, encoding a glycosylated membrane protein that is a non-specific receptor for several chemokines.

(medicine) A glycoprotein enzyme secreted by the epithelial cells of the prostate gland and becoming part of the ejaculate; used in the diagnosis of prostate cancer.

a complex of genes on chromosome 6 in humans which encode cell-surface proteins responsible for the regulation of the immune system