Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2hdhA 3lx3A 3rqsA 3rqsB 2hdhA 100 13 100 91 3lx3A 17 100 18 64 3rqsA 100 18 100 92 3rqsB 91 61 92 100 FOLD SIMILARITY (Z-SCORE) 2hdhA 3lx3A 3rqsA 3rqsB 2hdhA 48.5 0 44.7 43.7 3lx3A 0 30.7 0 0 3rqsA 44.7 0 49.6 46 3rqsB 43.7 0 46 50