FIG. 1.

A map of the T4 oriE region. (A) Positions of clones used in subcloning and site-directed mutagenesis of repEB and repEA. Italicized names refer to mutations of gene 5 that can be rescued by these clones. (B) Positions of relevant restriction sites in the T4 map (36). (C) Positions of late T4 genes. (D) Positions of late promoters and late transcripts synthesized from this region. (E) Positions of the two early genes described here and the iterons upstream of these genes. (F) Positions of an early promoter and early transcripts. (G) Approximate positions of RNA primer transcripts and of RNA-DNA transition sites, where leading-strand DNA synthesis is primed. Directions of transcription and translation are indicated by arrowheads.