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DELAYED LOSS OF THE ZONA PELLUCIDA FROM BLASTOCYSTS OF SUCKLING MICE

Summary.: 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 in the uterine lumen during the delay period without undergoing lysis.