Size Regulation of Aggregated Mouse Embryos in Postimplantation

Abstract

The development of mouse embryos formed by the aggregation of two 8-cell embryos was analysed in comparison with control single (normal) embryos. The analysis revealedthat:(1) No significant diffrence was observed in the weights of fetuse and placenta from postimplantation embryo at 18 days post coitum of recipient mice between aggregated and control embryos.(2) Postimplantation aggregated embryo was at about the same developmental stage as control embryo of the same chronological age, both before and after size regulation.(3) Size regulation of the aggregated embryos was brought about by 6 days and 5 hours post coitum of recipient mice.