Restriction sites are marked: BamHI (B), HindIII (H), PstI (P), EcoRI (RI), SalI (Sa), SmaI (Sm), SstI (Ss), XbaI (X).

This vector is described in Thummel et al. (1988) Gene 74: 445-456. It directs the expression of chloramphenicol acetyl transferase (CAT).