Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1l8dA 1l8dB 5goxA 1l8dA 100 99 37 1l8dB 99 100 37 5goxA 25 35 100 FOLD SIMILARITY (Z-SCORE) 1l8dA 1l8dB 5goxA 1l8dA 16.2 14.8 7.6 1l8dB 14.8 16.1 7.4 5goxA 4.1 5.4 19.6