Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3utmA 3utmB 3vpdA 3utmA 100 96 24 3utmB 96 100 54 3vpdA 32 53 100 FOLD SIMILARITY (Z-SCORE) 3utmA 3utmB 3vpdA 3utmA 41.3 36.7 0 3utmB 36.7 40.4 0 3vpdA 0 0 48.7