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Timetable of sperm chromatin decondensation in the fused nuclei of 50 independent rice zygotes. Zygotes were produced by in vitro fusion of a wild-type egg cell with a sperm cell expressing a H2B-GFP fusion protein, and the fluorescence signal was observed every 15 to 20 min after fusion. The y axis indicates the number of zygotes in which initial decondensation of sperm chromatin was observed.
