Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3a1mA 4ku0A 3a1mA 100 28 4ku0A 22 100 FOLD SIMILARITY (Z-SCORE) 3a1mA 4ku0A 3a1mA 12.1 4.4 4ku0A 4.5 11.8