Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1o5jA 2atpA 2atpB 1o5jA 100 59 48 2atpA 57 100 50 2atpB 0 50 100 FOLD SIMILARITY (Z-SCORE) 1o5jA 2atpA 2atpB 1o5jA 22.5 0 0 2atpA 0 27.1 15.8 2atpB 0 15.8 26.2