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Solution NMR structures of PltL species. a, holo-PltL. b, pyrrolyl-PltL. c, Expanded view of pyrrolyl-PltL with colors corresponding to CSP values from Fig. 2. Key residues are labelled. CSPs not determined are show in grey. d, Expanded view of surface-filled pyrrolyl-PltL structure illustrating pyrrole sequestration between the helix II/III cleft.
