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Chorion separation and cleavage. After fertilization, separation of the chorion from the vitelline membrane (white arrows) and initial cleavage (black arrows) occurred in all three crosses for each hermaphrodite. H ♂ = hermaphrodite sperm; H ♀ = hermaphrodite eggs; RS ♂ = sperm from wild Rabbit Slough (AK, USA) male; RS ♀ = eggs from wild Rabbit Slough female.
