Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2np5A 2np5C 4chiA 2np5A 100 99 0 2np5C 99 100 0 4chiA 0 0 100 FOLD SIMILARITY (Z-SCORE) 2np5A 2np5C 4chiA 2np5A 34.2 30 0 2np5C 30 34.2 0 4chiA 0 0 55.4