| pubmed-article:700283 | pubmed:abstractText | BUdR treatment of early cleavage stages is more effective on gastrulation the earlier the drug is administered before the 16-cell stage. The distribution of percentages of embryos gastrulating is in good agreement with the theoretical calculated values presented in part I and permit the assumption that BUdR may act by preventing normal transcription at, or shortly after, the 16-cell stage. | lld:pubmed |
