Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1vquA 1vquB 4fu0A 1vquA 100 99 62 1vquB 99 100 40 4fu0A 63 60 100 FOLD SIMILARITY (Z-SCORE) 1vquA 1vquB 4fu0A 1vquA 62.5 55.9 2.4 1vquB 55.9 61.4 0 4fu0A 2.5 2.6 59.2