Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1b25A 2uuuA 2uuuB 1b25A 100 100 80 2uuuA 75 100 99 2uuuB 100 99 100 FOLD SIMILARITY (Z-SCORE) 1b25A 2uuuA 2uuuB 1b25A 74.5 0.2 0 2uuuA 0 61.4 56.8 2uuuB 0.3 56.8 61.7