According to the predicted cis-acting elements within Ah-Chi-P, five forward primers,
Chi-P
1
to Chi-P
, and one reverse primer, Chi-R, were designed; each primer includes a BamHI
restriction site (Table 1). The primers were used to amplify 5'-deleted sequences of Ah-Chi-P. The
PCR amplification products were sequenced. The five promoters with 5'-deleted sequences were
named P
1
to P
5
5
.