FIG. 2.

Stained proteins after SDS-PAGE of outer membrane fractions of E. coli HK97 fhuA transformed with the plasmids listed in Table 1 that encoded the FhuA proteins indicated in the figure. Solid arrows denote complete FhuA and reconstituted FhuA, and dotted arrows denote corkless FhuA. The molecular masses of standard proteins in kDa are indicated. The nomenclature used is described in the legend for Fig. 1.