Definition: The principle immunoglobulin in exocrine secretions such as milk, respiratory and intestinal mucin, saliva and tears. The complete molecule (around 400 kD) is composed of two four-chain units of IMMUNOGLOBULIN A, one SECRETORY COMPONENT and one J chain (IMMUNOGLOBULIN J-CHAINS).
salivary immunoglobulin A: index IGA, SECRETORY + SALIVA/ immunol; immunoglobulin A in tears: index IGA, SECRETORY + TEARS/ immunol; /defic
Pharmacological ActionImmunologic Factors ExamplesSecretory Component
Other names Secretory IgA; SIgA; IgA, Secretory; IgA, Exocrine; Colostral IgA; IgA, Colostral; Exocrine IgA; Secretory Immunoglobulin A