Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3ezqA 3mahA 4yt2A 3ezqA 100 0 47 3mahA 18 100 62 4yt2A 47 64 100 FOLD SIMILARITY (Z-SCORE) 3ezqA 3mahA 4yt2A 3ezqA 20.1 0.9 0 3mahA 2.3 27.5 0 4yt2A 0 0 52.7