Abstract
Lambda-specific RNA extracted from lysogenic bacteria hybridizes specifically with fragments of λ DNA containing 43 per cent GC (guanine plus cytosine). Therefore genes known to function in the prophage state (cI and rex) lie 0.38 ± 0.08 fractional molecular length from the right end of the λ DNA molecule, according to the compositional map of Skalka, Burgi, and Hershey.
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