FIG. 2.

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of outer membrane proteins (FhuA, OmpF/OmpC, and OmpA) of E. coli MB98 transformed with the fhuA loop deletion mutants cloned into plasmid pT7-6 as listed in Table 1. The gel was stained with Serva blue. Molecular masses in kilodaltons of the markers (left lane) are indicated on the left.