Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1k28A 3a1mA 3a1mC 1k28A 100 0 0 3a1mA 30 100 99 3a1mC 0 99 100 FOLD SIMILARITY (Z-SCORE) 1k28A 3a1mA 3a1mC 1k28A 47.1 0 0 3a1mA 2.8 12.1 11.5 3a1mC 0 11.5 12