Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4txqA 4txqC 4u7eA 4u7eB 4txqA 100 0 0 99 4txqC 0 0 0 0 4u7eA 0 0 0 0 4u7eB 0 0 0 0 FOLD SIMILARITY (Z-SCORE) 4txqA 4txqC 4u7eA 4u7eB 4txqA 31.3 0 0 27.2 4txqC 0 0 0 0 4u7eA 0 0 0 0 4u7eB 0 0 0 0