Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3ht4A 3ht4C 3jzlA 3ht4A 100 99 91 3ht4C 99 100 92 3jzlA 91 92 100 FOLD SIMILARITY (Z-SCORE) 3ht4A 3ht4C 3jzlA 3ht4A 72.3 65.7 64.4 3ht4C 65.7 73.3 65 3jzlA 64.4 65 74.4