We analyzed GERA samples (see URLs; dbGaP study accession phs000674.v1.p1) typed on the GERA EUR chip48. The data contained 62,318 samples, of which we removed 961 with <90% European ancestry as determined by SNPweights v2.0 (ref.39). Among this subset of samples, we identified 197 trios from independent pedigrees according to relationships provided with the data release. We analyzed chromosome 10, which contained 32,741 SNPs.
