Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1cydA 2nugA 3ijrA 1cydA 100 61 76 2nugA 65 100 46 3ijrA 76 67 100 FOLD SIMILARITY (Z-SCORE) 1cydA 2nugA 3ijrA 1cydA 46.6 0 30.9 2nugA 0 33.9 0 3ijrA 30.9 0 55