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Fig. 4. Swimming speed of NMB191 cells expressing PomAB (pYA303), MomB5 with PomA or MomB6 with PomA. The cells were suspended in Tris-motility buffer (TMN50) and diluted 100-fold into buffers containing various concentration of Na+ (open squares) or Li+ (closed squares) as coupling ions, and the swimming speeds were measured.
