Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1sg2A 1sg2B 1u2mA 1u2mB 1sg2A 100 91 55 98 1sg2B 75 100 71 91 1u2mA 45 71 100 63 1u2mB 98 91 63 100 FOLD SIMILARITY (Z-SCORE) 1sg2A 1sg2B 1u2mA 1u2mB 1sg2A 20 10.9 12 13.8 1sg2B 13.7 19.3 14 16.2 1u2mA 12 14 18.5 13.4 1u2mB 13.8 16.2 13.4 19.1