Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3vg8A 3vg8B 4errA 3vg8A 100 92 0 3vg8B 92 100 0 4errA 0 0 100 FOLD SIMILARITY (Z-SCORE) 3vg8A 3vg8B 4errA 3vg8A 23.5 17 0 3vg8B 17 22.9 0 4errA 0 0 14.3