WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an antibody that occurs naturally against foreign tissues from a person of the same species
Word Usage
"1 In renal transplantation, acute cellular rejection has been viewed as a T-cell-dependent process, but B cells are required for alloantibody production and may also play other roles, including alloantigen presentation to T cells. 2"