SDS-PAGE analysis of soluble and insoluble fractions obtained from recombinant E. coli cell lysates. M, standard molecular markers; S and I (UGT76G1, CysQ-UGT, EDA-UGT and NusA-UGT), soluble and insoluble fractions from BL21(DE3) cells transformed with pET28a-UGT, pET28a-CysQ-UGT, pET28a-EDA-UGT and pET28a-NusA-UGT. Arrows in gel images indicate recombinant protein bands