the messenger rna ( mrna ) of the histidine operon synthesized in the in vitro system was detected by hybridization to single strands of both varphi80 and varphi80dhis dna , and by competition of this hybridization with unlabeled histidine mrna that had been synthesized in vivo ( rna extracted from cells in which the histidine operon had been derepressed ) .
C0035696
mrna
C0035668
rna