Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1b63A 1gkmA 1htoA 1b63A 100 71 40 1gkmA 69 100 89 1htoA 41 93 100 FOLD SIMILARITY (Z-SCORE) 1b63A 1gkmA 1htoA 1b63A 55.3 0 0 1gkmA 0 64.2 0 1htoA 0 0 70