家兎胚におけるsex chromatin : I. sex chromatin 染色核の局在性
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概要
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In order to facilitate the sexing of rabbit embryo, the appearance of sex chromatin and the localization of sex chromatin in blastocyst were investigated. The results are summarized as follows: 1. Sex chromatin in fertilized ova was not observed from 1 to 4 days of age. It seems to be due to absent of resting-stage nuclei. 2. Sex chromatin positive nuclei ware observed 35.4% or 51.2% in blastocysts of 5 or 6 days of age, respectively. 3. In 5 ages eggs, the localization of sex chromatin positive nuclei was observed, namely, the section of A (inner cell mass) was higher than the section of D (the area oppositing to inner cell mass).
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