Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2ihtA 3fmbA 3loiA 2ihtA 100 9 40 3fmbA 23 100 18 3loiA 20 3 100 FOLD SIMILARITY (Z-SCORE) 2ihtA 3fmbA 3loiA 2ihtA 70.1 0 0 3fmbA 0 22.9 0 3loiA 0 0 31.5