Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3n2oA 4y99A 4y99C 3n2oA 100 0 0 4y99A 55 100 0 4y99C 53 0 100 FOLD SIMILARITY (Z-SCORE) 3n2oA 4y99A 4y99C 3n2oA 53.8 0 0 4y99A 0.2 25.1 0 4y99C 0.3 0 10.8