Table 1. Characteristics of PCR primer sets used in this study.
| Primer | Target gene | Sequence 5′-3′ | Amplicon size (bp) | Reference |
| PAH-RHDα Fw | RHDα | GGA AAG GCT TGT GGG TGT CG | 252 | gi|494073952| |
| PAH-RHDα Re | RHDα | GTG GCA TCA TCG CAT CGT GT | 252 | gi|494073952| |
| HBMO Fw | 4-hydroxybenzoate 3-monooxygenase | GCG TGT GCC GCC TTG TAA TCA | 157 | gi|494072487| |
| HBMO Re | 4-hydroxybenzoate 3-monooxygenase | ACG CCA GTT CGT CCC AGA TGC | 157 | gi|494072487| |
| 968R | 16S rRNA | AAC GCG AAG AAC CTT AC | 433 | Felske A [20] |
| 1401F | 16S rRNA | CGG TGT GTA CAA GAC CC | 433 | Felske A [20] |