Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1z6rA 2ix4A 5u55A 5u55C 1z6rA 100 74 59 64 2ix4A 76 100 28 76 5u55A 31 89 100 99 5u55C 29 73 99 100 FOLD SIMILARITY (Z-SCORE) 1z6rA 2ix4A 5u55A 5u55C 1z6rA 63.6 0 0 0 2ix4A 0 79 0 0 5u55A 0 0 26.6 25.4 5u55C 0 0 25.4 26.6