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. Author manuscript; available in PMC: 2015 Jan 15.
Published in final edited form as: Cell Host Microbe. 2014 Jan 15;15(1):47–57. doi: 10.1016/j.chom.2013.12.007

Figure 2. The prominent human gut symbiont B. thetaiotaomicron encodes three functional B12 acquisition systems.

Figure 2

(A) Genetic organization of the canonical btuBFCD B12 transporter in E. coli and the three B12 transport systems in B. thetaiotaomicron. (B) Each B. thetaiotaomicron BtuB homolog supports doubling times equivalent to the wildtype strain in conditions that require B12 transport. Mean doubling times and standard deviations of triplicate cultures are shown. Wt, wildtype; Met, methionine. See also Figure S2.