Fig. 7. Sperm binding to solubilised apical plasma membrane protein fraction (sAPM)-coated beads. (A) Low magnification view of the sAPM-coated beads showing that although some spermatozoa are bound to the bead surfaces many unbound spermatozoa are also present. Bar, 100 µm. (B,C) Spermatozoa interact with the bead surface via the anterior acrosomal region (arrows) while the flagellae are unbound. Bars, 5 µm.