Cover shows subacrosomal layer of the sperm head capsule, the perinuclear theca (PT; red; a rabbit antibody against PT-protein IAM32 provided by Dr R Oko) disintegrates in the ooplasm after in vitro fertilization in pigs. A study by Katayma et al. (Reproduction 130 907) documents the beneficial effect of piezoelectric pulses on the disassembly of sperm PT and pronuclear formation after porcine intracytoplasmic sperm injection. Courtesy of Mika Katayama.
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