Single-nucleotide polymorphisms in the Toll-like receptor 9 gene (TLR9): frequencies, pairwise linkage disequilibrium, and haplotypes in three U.S. ethnic groups and exploratory case–control disease association studies☆☆This work was supported by Programs for Genomic Applications, Grant U01 HL66795, Innate Immunity in Heart, Lung and Blood Disease, from the National Heart, Lung and Blood Institute.