FIG. 1.

Sequence of the attP region of the temperate bacteriophage TP901-1. The bold sequence shows the coding region for the integrase of TP901-1 (Orf1). The core region is boxed, and the identical region is underlined. Direct and inverted repeats are indicated with black arrows above the sequence. Repeats identified by Christiansen et al. (8) are R1, R2, R3, R4, R5, and R6, whereas the recently identified inverted repeat is P1. The numbers and small arrows under the sequence indicate the borders of the different attP fragments. The largest attP fragment contains all bases shown, e.g., 1 to 333. Base 1 corresponds to base 2499 in the sequence deposited in GenBank.