Fig. 5

Comparative structures of the OmpA proteins. Comparative structures of the OmpA proteins from six protein clusters (P1, P2, P3, P4, C1, and C2) according to the protein phylogenetic tree (Fig. 2b) of the OmpA proteins of P. multocida. A side view of the conserved transmembrane ß-sheets is shown in a, and the four hypervariable loops are shown in the top view (b). The individual extracellular loops are compared in c. The colours represent different proteins: orange indicates isolate 21P, blue indicates isolate 32P, green indicates isolate 42P, yellow indicates isolate 91P, pink indicates isolate 34C, and red indicates isolate 84C