we have investigated the activation of transcription from the pre promoters of phages lambda , 21 and p22 by the lambda and 21 cii proteins and the p22 c1 ( cii-like ) protein , using an in vivo system in which cii protein from a derepressed prophage activates transcription from a pre dna fragment on a multicopy plasmid .
C0162493
activation
C0040649
transcription