Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1tbxA 1tbxB 2ltnA 2ltnB 1tbxA 100 99 19 0 1tbxB 99 100 17 0 2ltnA 14 19 100 0 2ltnB 0 0 4 100 FOLD SIMILARITY (Z-SCORE) 1tbxA 1tbxB 2ltnA 2ltnB 1tbxA 22 19.6 0 0 1tbxB 19.6 22 0 0 2ltnA 0 0 34.4 0 2ltnB 0 0 0 6.7