Pluripotency of mouse embryonic cells on germline at 3.5–8.5 and 11.5 days post‐coitum after aggregation with precompacted embryos

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Abstract
Albino mouse embryonic cells (Gpi‐la/a) at 3.5–8.5 and 11.5 days were aggregated with zona cut 8–16 cell stage embryos from F1 females (Gpi‐1 b/b), respectively. The aggregated embryos were transferred to pseudopregnant female mice. The recipients were allowed to go to term or were dissected at mid‐gestation to assess the donor contribution in the conceptuses using glucose phosphate isomerase (GPI) analysis. The donor cells, which were previously labeled with fluorescent latex microparticles, were aggregated with embryos, and the allocation of the donor cells at the compacted morula and blastocyst stages were observed under a fluorescence microscope. When 3.5 and 45 day old inner‐cell‐mass (ICM) cells were used, fertile chimeric mice were obtained (50 and 19%, respectively), and when 5.5 days old primitive ectoderm cells were aggregated, they did not form chimeras but contributed to the fetuses, placenta and membrane after 13.5 days of pregnancy. However, cells from further stages never contributed to the conceptuses even though they were analyzed after 10.5 days of pregnancy. The labeled donor cells at these stages were not positively incorporated in the interior part of the compacted morula and the ICM of the blastocyst stage unlike the ICM at 3.5 days post‐coitum after overnight culture.