Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2axta 2axtl 4ub6A 4ub6L 2axta 100 0 100 0 2axtl 0 100 0 100 4ub6A 100 0 100 0 4ub6L 0 100 0 100 FOLD SIMILARITY (Z-SCORE) 2axta 2axtl 4ub6A 4ub6L 2axta 43.2 0 40.1 0 2axtl 0 4.9 0 4.5 4ub6A 40.1 0 43.4 0 4ub6L 0 4.5 0 5