Twelfth gestation day kreisler otocysts were explanted into an organ culture system and allowed to develop for nine days. The homozygotic (kr/kr) kreisler otocysts showed significant developmental differences when compared to the development that occurred in the organ culture specimens of the otocysts of its heterozygotic (+ /kr) litter mates. The differences in development observed in vitro were the same major developmental differences that had been observed in vivo. The phenotypic expression of the kreisler genome has expressed itself in vitro in the homozygotic kreisler otocyst.
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