Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2r1fA 3c3jA 5iklB 2r1fA 100 50 79 3c3jA 19 100 82 5iklB 63 80 100 FOLD SIMILARITY (Z-SCORE) 2r1fA 3c3jA 5iklB 2r1fA 39.7 0 0 3c3jA 0 68.9 1.2 5iklB 0 1.3 66.2