English: Two views, one rotated 90 degrees with respect to the other, of the amino acid chains comprising secretory IgA1. Colors are: H-chains (blue and light blue), L-chains (red and light red), J-chain (magenta) and the secretory component (yellow). Coordinates of each backbone carbon atom were derived from PDB entry 3CHN (Bonner A, Almogren A, Furtado PB, Kerr MA, Perkins SJ. Location of secretory
component on the Fc edge of dimeric IgA1 reveals insight into the role of
secretory IgA1 in mucosal immunity. Mucosal Immunol. 2009 Jan;2(1):74-84. doi:
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