Figure 29-1: The genetic map of bacteriophage P22. The genes are positioned above the line (not to scale), with their function indicated above. Promoter regions, and the loci of repressor action are indicated below the line. The c2 repressor protein inhibits synthesis of the early genes. P(l) and P(r) The anti-terminators 24 and 23, result in expression of the early and late genes respectively. Notice that genes with related functions are clustered.