Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3rbnA 3rbnB 5woqA 3rbnA 100 96 0 3rbnB 96 100 0 5woqA 6 6 100 FOLD SIMILARITY (Z-SCORE) 3rbnA 3rbnB 5woqA 3rbnA 45.2 38.1 0 3rbnB 38.1 42 0 5woqA 0 0 20