Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1nlxI 3q2kA 3q2kB 1nlxI 100 42 3 3q2kA 0 100 99 3q2kB 3 99 100 FOLD SIMILARITY (Z-SCORE) 1nlxI 3q2kA 3q2kB 1nlxI 23.6 0.8 0 3q2kA 0 61.6 51.8 3q2kB 0 51.8 57.1