Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1bb1A 1bb1B 1bb1C 1df4A 4r0rA 1bb1A 100 68 76 7 3 1bb1B 27 100 65 3 6 1bb1C 18 12 100 0 12 1df4A 16 23 10 100 3 4r0rA 9 6 9 0 100 FOLD SIMILARITY (Z-SCORE) 1bb1A 1bb1B 1bb1C 1df4A 4r0rA 1bb1A 5.5 5 4.7 2.6 4 1bb1B 4.6 5.5 4.7 2.2 4.1 1bb1C 4.3 4.2 5.5 2.1 3.8 1df4A 3.1 3.1 3.1 11.4 2.5 4r0rA 4.1 4.1 3.9 2.6 6.8