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In vitro transcription of SPP1 DNA occurred on only one of the two strands, the same which is predominantly transcribed in SPP1-infected cells. Transcripts were distributed in several size classes. Analysis of elongation kinetics and of size distribution, coupled with hybridization to DNA restriction fragments, showed that some regions of the template have more initiation sites than others; some have none. Some regions were transcribed directly, some were transcribed from initiation sites located in other regions, and one was never transcribed. Several transcription initiation sites on SPP1 DNA are located on EcoRI fragment 1; four to five others are distributed among other fragments. Cutting the DNA with EcoRI did not introduce artifactual initiation sites. In vitro transcription units can be localized and oriented with respect to the EcoRI restriction map of SPP1 DNA.

Restriction fragment analysis of bacteriophage SPP1 in vitro transcription by host RNA polymerase