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#immunoglobulin a #iga #breast milk antibody #colostrum antibody #passive immunity #infant immunity

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#immunoglobulin a #iga #antibody #secretory antibody #mucosal immunity #tears antibody #saliva antibody

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#primary mucosal antibody #first line defense iga #immunoglobulin a #iga abundance #main secretory antibody

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#mucosal barrier #iga defense #gut immunity #respiratory immunity #iga function #immunoglobulin a