n amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions
n a medicine used to treat the gastric effects of histamine in cases of peptic ulcers and gastritis and gastroesophageal reflux; works by blocking the effects of histamine on the receptor site known as H2
n condition in which the cells of one tissue can survive in the presence of cells of another tissue
a successful graft or transplant requires a high degree of histocompatibility
n a family of fifty or more genes on the sixth human chromosome that code for proteins on the surfaces of cells and that play a role in the immune response