BIOSYNTHESIS OF POLYNUCLEOTIDES 435 5. In a period of 15 min., adenosine 5'-di-and-tri-phosphate, but not adenosine 5'-monophosphate, suppress the incorporation of [32p] orthophosphate into only the adenosine 5'-monophosphate residues of ribonucleic acid. The authors are indebted to the British Empire Cancer Campaign for financial support and one of them (M.J.) thanks the Department of Scientific and Industrial Research for a maintenance grant.
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