Restriction digest map of the overlapping inserts of genomic clones “A” and “Φ”.

The arrow marked by +1 symbolizes the initiation site and the direction of transcription. ‘atg’, marks the site of translation initiation. The scale (1 kb) is shown by a small bar. The enzymes used for mapping are: B: BamHI; E: EcoRI; H: HindIII; K: KpnI; S: SalI; Sc: SacI.