The predominant immunoglobulin found in exocrine secretions of humans and m
ost other mammals is secretory IgA, a polymeric form of IgA containing an a
dditional glycoprotein chain designated "secretory component." In this arti
cle recommended abbreviations are proposed for the following forms of human
IgA and other proteins of related interest: secretory IgA, secretory IgM,
secretory component, polymeric immunoglobulin receptor, polymeric IgA, mono
meric IgA, IgA subclass 1, IgA subclass 2, A2 allotype marker 1, and A2 all
otype marker 2.