Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1musA 1xrsA 2xijA 1musA 100 100 71 1xrsA 100 100 98 2xijA 89 100 100 FOLD SIMILARITY (Z-SCORE) 1musA 1xrsA 2xijA 1musA 64 0.6 1 1xrsA 0 68 16.6 2xijA 0 6.6 70.6