Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1y2mA 1y2mB 4e6uA 1y2mA 100 99 100 1y2mB 99 100 45 4e6uA 44 48 100 FOLD SIMILARITY (Z-SCORE) 1y2mA 1y2mB 4e6uA 1y2mA 59.2 55.1 2.4 1y2mB 55.1 64.4 0 4e6uA 0 0 45.8