Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1n2sA 2afbA 2afbB 1n2sA 100 75 79 2afbA 63 100 99 2afbB 61 99 100 FOLD SIMILARITY (Z-SCORE) 1n2sA 2afbA 2afbB 1n2sA 53.2 2.2 2.1 2afbA 5.8 62.4 58.8 2afbB 6.2 58.8 61.8