Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3loiA 3t30A 3t30E 3loiA 100 29 27 3t30A 32 100 99 3t30E 30 99 100 FOLD SIMILARITY (Z-SCORE) 3loiA 3t30A 3t30E 3loiA 31.5 3.1 2.8 3t30A 3 22.3 20 3t30E 2.8 20 22.3