Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2a5hA 4or5B 4or5C 2a5hA 100 74 0 4or5B 75 100 0 4or5C 4 0 100 FOLD SIMILARITY (Z-SCORE) 2a5hA 4or5B 4or5C 2a5hA 65 0 0 4or5B 0 42.8 0 4or5C 0 0 9.6