There are four major blood type groups: A, B, AB, and O. Your blood type is determined by the presence or absence of specific antigens (proteins and sugars)—which act as identification markers—on the ...

T cells, move over. B cells are now reported, in a recent paper in Nature, to have their own immunological synapses with APCs. Only this time the antigen is whole and B cells don't keep it to ...

A SERUM that identifies a new blood-group antigen was obtained from the parturient mother of a baby with erythroblastosis fœtalis. Mrs. Kidd had had five previous pregnancies but no blood ...