Abstract
The action of certain inhibitors of RNA and protein syntheses on the morphology of the loops of lampbrush chromosomes in amphibian oocytes was studied. Cordycepin, which affects the synthesis of nuclear heterogeneous RNA, induces a complete retraction of the loops into the chromomeres. On the other side puromycin and cycloheximide do not induce any changes in the morhology of lambrush chromosomes.
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