For
the
DAT1 VNTR,
total genomic DNA (60 ng) was combined with
1× MBI Fermentas PCR buffer containing KCl, 1.5 mM MgCl (MBI
Fermentas), 0.13 μg each primer (forward primer labeled with 5′ NED
fluorescent tag), 10% DMSO (Sigma-Aldrich), 0.16 mM each dNTP (MBI
Fermentas) and 2 U Taq polymerase (MBI Fermentas) to a total
volume of 25 μl in a 96-well PCR plate. The PCR reactions were subjected
to an initial denaturation for 5 min at 95 °C, followed by 35 cycles of
amplification in an AB 2720 thermal cycler: denaturing for 30 s at
95 °C, annealing for 1 min at 65 °C and extension for 30 s at 72 °C