Selective amplification was achieved with the primers designed EcoRI and Msel digestion the sites but expanded with two and three additional nucleotides, respectively . for fluorescence diagnosis the primers for EcoRI digestion enzyme were labeled with either 5-carboxy fluorescein (5-FAM) or 5-hexachloro-fluo rescein (5-Hex), while the Msel primers were unlabeled High selectivity was obtained from implementing the following cycling profile: 94 C for 30 s, 65'C for 30 s, and 72 C for 1 min for 1 cycle and then lowering the annealing temperature by 0.7 C for each of 13 cycles to 56 C, followed by an additional 30 cycles at a 56 C annealing temperature. All PCR experiments were performed on a GeneAmp PCR System 2400 thermocycler (Applied Biosystems, Inc.). Table 2 lists the primer sequences and the fluorescent tags. PCR products (1.5-2.0 u) were mixed with 0.2 ul of an internal length standard (GenescanTM500ROxTM), denatured for 3 min at 90 Cand quickly chilled on ice. Amplification products were separated by electrophoresis using a standard 36 cm POP-7 Polymer Fragment Analysis module on an ABI Prism 3730 sequence