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Binding of [57Co]CNCbl by outer membranes containing BtuB loop deletion variants. Binding values (in picomoles per milligram of OM protein) were determined for outer membranes by using cells carrying pAG1 derivatives expressing wild-type BtuB, ΔL10, ΔL7-1, and ΔL7-2. All binding data are averages, and the values are fit to a single hyperbolic binding curve. prot, protein.
