. The eggs of mammals . Fig. 31. Left, normal rabbit blastocysts of the 5th day of pregnancy. Right, blastocysts of the 5th day of pregnancy from rabbit doe ovariectomized 18 hours after mating. (From the American Journal of Physiology.) have never observed pH values below Nonetheless it is possible that in the small decidual crypts into which the ova fall the critical acidity may be attained. Burdick and Pincus (1935) and Pincus and Kirsch (1936) have examined this critical stage of development from a somewhat different angle. Corner (1928) had noted that in rabbit does in which both ova
. The eggs of mammals . Fig. 31. Left, normal rabbit blastocysts of the 5th day of pregnancy. Right, blastocysts of the 5th day of pregnancy from rabbit doe ovariectomized 18 hours after mating. (From the American Journal of Physiology.) have never observed pH values below Nonetheless it is possible that in the small decidual crypts into which the ova fall the critical acidity may be attained. Burdick and Pincus (1935) and Pincus and Kirsch (1936) have examined this critical stage of development from a somewhat different angle. Corner (1928) had noted that in rabbit does in which both ovaries or all the corpora lutea were removed shortly after fertilization the uterine ova remained in the early blastocyst stage (see Figure 31 and Tables XX to XXII), whereas in control rabbits with corpora lutea normal development occurred. The degenerating blastocysts were associated with an oestrus type of endo- metrium, and normal growth of a progestational endome- trium with implantation of embryos occurred when corpus
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