Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1ibjA 1u8sA 5t7oA 1ibjA 100 20 77 1u8sA 28 100 62 5t7oA 78 17 100 FOLD SIMILARITY (Z-SCORE) 1ibjA 1u8sA 5t7oA 1ibjA 67.7 0.6 1.5 1u8sA 0.6 27 0 5t7oA 1.4 0 60