| Genomic DNA was PCR amplified with multiplexed primers, and hybridized |
| to high density oligonucleotide arrays having multiple perfect-match |
| probes for each of two SNP alleles, for forward and reverse strands, |
| plus mismatch probes. Chips were stained with streptavidin-Cy-chrome |
| conjugate and scanned using custom built confocal scanners. Genotypes |
| were determined based on a cluster analysis of intensity ratios of |
| perfect-match probes for each allele. |