Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1fr3A 4e79A 5cyxA 1fr3A 100 0 5 4e79A 0 100 66 5cyxA 8 62 100 FOLD SIMILARITY (Z-SCORE) 1fr3A 4e79A 5cyxA 1fr3A 15 0 0.5 4e79A 0 45.8 0 5cyxA 0 0 34.4