Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 4kt0A 4kt0B 4rkuA 4rkuB 4kt0A 100 93 96 93 4kt0B 93 100 94 98 4rkuA 96 94 100 94 4rkuB 93 98 94 100 FOLD SIMILARITY (Z-SCORE) 4kt0A 4kt0B 4rkuA 4rkuB 4kt0A 60.1 35.3 45.6 34.9 4kt0B 35.2 55 37.8 48.5 4rkuA 45.6 37.8 56.9 36 4rkuB 34.9 48.5 36 55.2