3M8O:
reference: Structure of a human IgA1 Fab fragment at 1.55 A resolution: potential effect of the constant domains on antigen-affinity modulation., Correa A, Trajtenberg F, Obal G, Pritsch O, Dighiero G, Oppezzo P, Buschiazzo A, Acta Crystallogr D Biol Crystallogr. 2013 Mar;69(Pt 3):388-97. doi:, 10.1107/S0907444912048664. Epub 2013 Feb 16. PMID: 23519414

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