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Transmission electron micrographs showing the SAR. Panel shows low and high magnification electron micrographs of an oblique cross section through the murine sperm head showing the nucleus (N), acrosomal vesicle (A) and the different regions of the plasma membrane [plasma membrane overlying the acrosome, APM domain; post-acrosomal plasma membrane, PAPM; sub-acrosomal ring, SAR]. Note the electron-dense material underlying the plasma membrane at the SAR.
