Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3fcnA 3u4gA 5m97A 3fcnA 100 0 10 3u4gA 0 100 0 5m97A 4 0 100 FOLD SIMILARITY (Z-SCORE) 3fcnA 3u4gA 5m97A 3fcnA 25.9 0 2.2 3u4gA 0 65.3 0 5m97A 1.7 0 10