DELAYED LOSS OF THE ZONA PELLUCIDA FROM BLASTOCYSTS OF SUCKLING MICE

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Abstract
Mouse blastocysts retain the zona pellucida longer in lactating females when implantation is delayed than during normal pregnancy. For most of the period of delay, however, they are free of the zona, but do not induce Pontamine Blue reactivity in the uterus. The shed zonae often remain the uterine lumen during the delay period without undergoing lysis.

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