1648457 SNP single nucleotide polymorphism 21858 4049619 SNP-array single nucleotide polymorphism array 210 3507822 SNP-A single nucleotide polymorphism array 66 4049622 SNP Array single nucleotide polymorphism array 2 4048065 SNP arrry single nucleotide polymorphism array 1 3784933 SNP-arry single nucleotide polymorphism array 1