Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4mayA 4p2oA 4p2oP 4mayA 100 78 0 4p2oA 78 100 0 4p2oP 0 0 0 FOLD SIMILARITY (Z-SCORE) 4mayA 4p2oA 4p2oP 4mayA 30.6 24.5 0 4p2oA 24.5 29.7 0 4p2oP 0 0 0