Characterization of Shsp1/Mm.87328, Sfap1/Mm.386907 and Sfap2/Mm.157049. (A) Acrosome reaction of sperm from the epididymis and vas deferens was induced by calcium ionophore A23187. Acrosome-intact and -reacted sperm were subjected to western blot anaylsis with the anti-Shsp1/Mm.87328 antibody. AI, acrosome-intact sperm; AR, acrosome-reacted sperm. (B) Sperm from the epididymis and vas deferens were treated with 1% Triton X-100 and urea with different concentrations (2, 3, 4 and 6 M). Soluble and insoluble fractions after centrifugation of the treated sperm were subjected to western blot anaylsis with the anti-Sfap1/Mm.386907 and anti-Sfap2/Mm.157049 antibodies. Sup, supernatant after centrifugation; Pt, pellet after centrifugation.