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Biological processes are optimized by circadian and circannual biological timing systems. In vertebrates, the pineal gland plays an essential role in these systems by converting time into a hormonal signal, melatonin; in all vertebrates, circulating melatonin is elevated at night, independent of li...
ORGANISM(S): Rattus norvegicus 
Individual zona free in vitro grown bovine day 7 blastocysts were compared to stage and quality matched nuclear transfer derived blastocysts (fibroblast donor cells).
ORGANISM(S): Bos taurus 
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