Class of immunoglobulin (Ig) characterized by $\ce{\upalpha\!}$
heavy chains.
Note: IgA antibodies are secreted mainly by
mucosal lymphoid tissues, and in the dimeric form are present in
mucosal secretions. IgA in the monomeric form is present in blood.
Source: PAC, 2012,
84, 1113. (
IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1187 [
Terms] [
Paper]