Concentration profiles of metabolites. (A) cis-phenanthrene dihydrodiols (P1, P2, P3); (B) benzocoumarins (P4, P5) and diphenic acid (P8); (C) o-hydroxynaphthoic acids (P11, P12) and naphthalene-1,2-dicarboxylic acid (P13); (D) naphthalene-1,2-diol (P15), 2-carboxybenzalpyruvate (P16), coumarin (P17) and 2-carboxycinnamic acid (P18); (E) 2-formylbenzoic acid (P19), salicylic acid (P20) and phthalic acid (P21). Results were average values of two separate experiments. The metabolites P6, P7, P9, P10 and P14 were not shown in Fig. 2.