After a denaturation step at 94 C for 5 min,
amplification reactions were run for 35 cycles for 1 min at 94 C,
1 min at the annealing temperature chosen for the two primers,
and 1 min at 72 C. A final elongation step was run at 72 C for
7 min. The amplification products were cloned in pGEM-T vector
(Promega) for sequencing analysis.