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Fertilized rabbit and hamster oocytes. Scale bar shows 30 μm. Arrows indicate pronuclei. a Monospermic rabbit oocyte cultured without 4‐methylumbelliferone. b Polyspermic rabbit oocyte cultured with 0.25 mm 4‐methylumbelliferone. c Monospermic hamster oocyte cultured without 4‐methylumbelliferone. d Polyspermic hamster oocyte cultured with 0.25 mm 4‐methylumbelliferone
