Major Histocompatibility Antigens Are

Multiple Choice

Major histocompatibility antigens are

A) antigens attached to foreign invaders.
B) glycoproteins found in the cytoplasmic membranes of most vertebrate animal cells.
C) antigens that must be processed by cells called histiocytes in order to be recognized by the immune system.
D) not really antigens, but rather antibodies produced to mask foreign antigens.
E) antigens that provoke allergic reactions.