antigen excess n.
In a precipitation test, the presence of uncombined antigen above that required to combine with all of the antibody.
Immunology. any substance that can stimulate the production of and combine specifically with them. Pharmacology. any commercial substance that, when injected or absorbed into animal tissues, stimulates the production of . antigens of a particular type collectively. Contemporary Examples At the time his PSA screening revealed only a slightly higher level of the antigen than […]
- Antigen unit
antigen unit antigen unit n. The smallest amount of antigen that, in the presence of specific antiserum, will bind to one complement unit.
- Antigen-antibody reaction
antigen-antibody reaction antigen-antibody reaction n. The binding of an antibody with an antigen of the type that stimulated the formation of the antibody, resulting in agglutination, precipitation, complement fixation, greater susceptibility to ingestion and destruction by phagocytes, or neutralization of an exotoxin.
- Antigen-presenting cell
antigen-presenting cell antigen-presenting cell n. A cell, originating in the bone marrow and subsequently found as a dendritic cell in various locations, that facilitates the immune response by holding antigens on its surface and presenting them to lymphocytes.