immunoglobulin A(redirected from Alpha heavy chain disease)
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Related to Alpha heavy chain disease: mu heavy chain disease
immunoglobulin A[‚im·yə·nō‚gläb·yə·lən ′ā]
A class of immunoglobulins that inhibits the binding of microorganisms to mucosal surfaces; large amounts are found in breast milk, saliva, and gastrointestinal secretions. Abbreviated IgA.