Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3n40F 3n44B 3n44F 3n40F 100 95 99 3n44B 93 100 94 3n44F 99 71 100 FOLD SIMILARITY (Z-SCORE) 3n40F 3n44B 3n44F 3n40F 50.7 1.2 47.1 3n44B 1.5 44.4 3.3 3n44F 47.1 1.7 50.2