CD33 single nucleotide polymorphism (SNP) map. SNPs shaded in pink were reported recently (Lamba et al22); SNPs shaded in blue were evaluated in this study. For linked SNPs rs3865444 and rs12459419, only rs12459419 was used in creation of the CD33 composite SNP score. AA, African American; LD, linkage disequilibrium; UTR, untranslated region; W, white.