Abstract
A complex of the replicative form of [phi] X-174 DNA (RF-DNA) and messenger RNA was detected in [phi] X-174 infected Escherichla coli. This complex has characteristics similar to those which were found in in vitro systems where the replicative form of [phi]X-174 DNA was used as a template for an E. coli DNA-depen-dent RNA polymerase. The RF-DNA and the RNA are combined in an RNase-resistant structure which survives deproteinization by phenoichloroform and Duponol. The RNase-resistant structure involves the coding strand of RF-DNA. Heating or formamide treatment of the complex separates the RF-DNA and the RNA. It is concluded that the DNA-RNA hybrid complex is involved in the process of genetic transcription.

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