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The switching of activated B cells from IgM biosynthesis to biosynthesis of an IgA isotype, accomplished through a recombination process involving an intrachromosomal deletion between switch regions that reside 5\' of the IgM and one of the IgA constant region gene segments in the immunoglobulin heavy chain locus. [ISBN:0781735149, PMID:12370374, PMID:2113175, PMID:9186655]
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