Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3ht4A 3ht4F 3jzlA 4asiA 3ht4A 100 99 91 87 3ht4F 99 100 92 100 3jzlA 91 92 100 86 4asiA 87 100 88 100 FOLD SIMILARITY (Z-SCORE) 3ht4A 3ht4F 3jzlA 4asiA 3ht4A 72.3 65.6 64.4 0 3ht4F 65.6 73.5 65.2 0 3jzlA 64.4 65.2 74.4 0.3 4asiA 0 0 0.2 57.7