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A) Immunohistochemical staining (brown with blue hematoxylin counterstain) showing IgA from CD serum binding at the syncytial (maternal) surface of term placenta; B) binding is abolished by preincubation of serum with recombinant tissue transglutaminase; C) negative control serum fails to stain. Scale bar: 250 μm (a, c), 60 μm (b).
