Genetic map of phage ΦAA91-ss. Relevant phage genes, identified by comparison to other P2-like phages, are indicated. Arrows show gene size, orientation, and context. Those ORFs without defined function are shown by ORF number. The scale (in kb) is indicated in the upper part of the figure. The origin of replication (ori), the cohesive ends (cosR and cosL), and the phage attachment site (attP) are indicated.