Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1rfxA 4cayA 4cayC 1rfxA 100 0 0 4cayA 0 100 0 4cayC 0 0 0 FOLD SIMILARITY (Z-SCORE) 1rfxA 4cayA 4cayC 1rfxA 15.3 0 0 4cayA 0 16.1 0 4cayC 0 0 0