Genomic organization of phages Xop411, Xp10 and OP1. Colored arrows indicate the directions and categories (denoted below) of the genes. The bars between the genomic maps indicate the identities at the nucleotide level between Xop411 and Xp10 (upper) and between Xop411 and OP1 (lower); black denotes regions of > 80% identity; grey denotes regions of 65–80% identity; and white denotes regions of < 65% identity. Insertions are indicated with filled arrowheads and deletions with empty arrowheads. Knobs indicate the positions of predicted terminators.