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Linkage disequilibrium (LD) matrix (r2 for individuals with European ancestry from zero [white] to one [black]), highlighting four LD blocks that contain the 13 single nucleotide polymorphisms on chromosome 4q32.1 with P values of less than 10-5, with a mean between-LD block r2 of .50 and a mean within-LD block r2 of .96 (25).
