Figure 2
Superposed B chains from the four structures. (a) C2urea, (b) C2scn, (c) C2221urea and (d) C2221scn. Three B chains in each of the two C2 structures and the majority of the B chains in the C2221 structures have the PheB1 residue in an extended conformation (the top most population). Labels indicate chain names used in the final PDB files. For illustrative purpose, the side chain of the C-terminal LysB29 is included in the figures to illustrate the flexibility. This side-chain was subsequently omitted from several chains in the final PDB files due to disordered electron density.