Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1zkgA 1zkgB 3citA 4xk2A 1zkgA 100 99 46 46 1zkgB 99 100 56 49 3citA 36 56 100 56 4xk2A 45 0 58 100 FOLD SIMILARITY (Z-SCORE) 1zkgA 1zkgB 3citA 4xk2A 1zkgA 33.2 29.1 2.4 0 1zkgB 29.1 33.4 0.8 0 3citA 2.6 0.9 31.9 0 4xk2A 0 0 0 55.9