Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3a1mA 3a1mC 4ku0A 3a1mA 100 99 28 3a1mC 99 100 39 4ku0A 22 44 100 FOLD SIMILARITY (Z-SCORE) 3a1mA 3a1mC 4ku0A 3a1mA 12.1 11.5 4.4 3a1mC 11.5 12 4.9 4ku0A 4.5 4.2 11.8