| Km antigen | Allotypic antigens that are present on human kappa immunoglobulin light chains. Synonym: InV group antigen. (05 Mar 2000) |
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| Kveim antigen | A saline suspension of human sarcoid tissue prepared from the spleen of an individual with active sarcoidosis; used in the Kveim test. Synonym: Kveim-Stilzbach antigen. (05 Mar 2000) |
| Kveim-Stilzbach antigen | A saline suspension of human sarcoid tissue prepared from the spleen of an individual with active sarcoidosis; used in the Kveim test. Synonym: Kveim-Stilzbach antigen. (05 Mar 2000) |
| flagellar antigen | The heat-labile antigen's associated with bacterial flagella, in contrast to somatic antigen. See: H antigen. (05 Mar 2000) |
| Forssman antigen | A glycolipid heterophil antigen present on tissue cells of many species. It was first described for sheep red cells and is not present on human, rabbit, rat, porcine or bovine cells. (18 Nov 1997) |
| Forssman antigen-antibody reaction | The combination of Forssman antibody with heterogenetic antigen of the Forssman type, as in the agglutination of sheep erythrocytes (which contain Forssman antigen) by serum from a person with infectious mononucleosis which contains Forssman antibody. Synonym: Forssman reaction. (05 Mar 2000) |
| fos-related antigen | <molecular biology> A group of phosphoproteins found in the cell nucleus which are structurally similar to the fos oncogene's gene product. (06 Mar 1998) |
| leukocyte common antigen | Family of glycoproteins found on most leukocytes and absent from other cell types. These cell surface antigens can comprise up to 10% of the membrane proteins. (05 Mar 2000) |
| Lyb antigen | Surface antigens of mouse B-cells. (18 Nov 1997) |
| lymphocyte function associated antigen | A member of the integrin family that is expressed on all leukocytes and binds to ICAM-1 and ICAM-2 on a variety of cells. (05 Mar 2000) |
| lymphocyte function-associated antigen-1 | A heterodimer molecule widely expressed on cells of haematopoietic origin. Cd11a antigen comprises the alpha chain and the CD18 antigen (antigens, CD18) the beta chain. Lfa-1 is a major receptor of T-cells, B-cells, and granulocytes. It mediates the leukocyte adhesion reactions underlying cytolytic conjugate formation, helper T-cell interactions, and antibody-dependent killing by natural killer cells and granulocytes. Intracellular adhesion molecule-1 (icam-1) has been defined as a ligand for lfa-1. (12 Dec 1998) |
| lymphogranuloma venereum antigen | A sterile preparation of inactivated chlamydiae grown in the yolk sac of domestic fowl and used as an antigen in the Frei test. (05 Mar 2000) |
| Lyt antigen | A set of plasmalemmal surface glycoproteins on mouse T lymphocytes. Possession of Lyt 1 partly defines a T helper cell and of Lyt 2, 3 suppressor and cytotoxic cells. Formerly known as Ly antigens. See: Lyb antigen. (18 Nov 1997) |