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Schematic representation of a human secretory IgA subtype 2 (sIgA2). All components and possible glycosylation sites of sIGA2 as well as the changes occurring under acidic conditions are shown. The IgA dimer compose of four heavy chains (orange and yellow Cα1-3 and VH), four light chains (red and pastel-red), and a joining chain (J chain in dark blue) that connects dimers and a secretory component (blue I-V) by disulfide bridges (brown line) (45, 46). Created with BioRender.com.
