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The DNA of the Bacillus subtilis bacteriophage SP82 has been separated into heavy (H) and light (L) fractions by centrifugation in buoyant density gradients in the presence of polyguanylic acid. Competition-hybridization experiments were performed with these separated fractions using RNAs isolated from cells labeled at intervals which account for 80% of the lytic cycle and unlabeled competitor RNAs isolated from phage-infected cells at 2-min intervals throughout infection. The analysis of temporal RNA classes were facilitated by use of a double reciprocal plot of the data. Five temporal classes binding to the H fraction and three binding to the L fraction were detected; the possible existence of an additional class transcribed from the H fraction is discussed. RNA synthesized in the presence of chloramphenicol contains two of the three classes produced from L-DNA and two of the five classes transcribed from H-DNA.

DNA strand specificity of temporal RNA classes produced during infection of Bacillus subtilis by SP82