Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1f7lA 2x4kA 1f7lA 100 0 2x4kA 8 100 FOLD SIMILARITY (Z-SCORE) 1f7lA 2x4kA 1f7lA 27.3 0 2x4kA 0.4 12.3