Figure. Neighbor-joining (NJ) phylogeny of NADH oxidase (nox) sequences of Brachyspira pilosicoli from 5 cholera patients (A–E). The nox sequences were PCR amplified, cloned, and sequenced from each patient (individual clones are appended _SX). Published sequences from known species are included for reference. NJ analysis was performed by using an NJ model and 1,000 bootstraps. Bootstrap values >800 are presented next to nodes. The scale bar indicates a 2% bp change (contiguous sequence ≈990 bp).