Comparisons of the B factors of the crystal structures. The B factors of Cα atoms for Mol X, Mol A and Mol B are shown in (a), (b) and (c), respectively (filled symbols for HP67 and open symbols for H41Y). The B factors of Cα atoms for Mol X, Mol A and Mol B are shown in (d) for HP67 and (e) for H41Y (squares, Mol X; triangles, Mol A; circles, Mol B).