Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3ndnA 4ozrE 4ozrU 3ndnA 100 58 41 4ozrE 60 100 72 4ozrU 60 72 100 FOLD SIMILARITY (Z-SCORE) 3ndnA 4ozrE 4ozrU 3ndnA 70.2 0 0 4ozrE 0 35 17.6 4ozrU 0 17.6 34.5