The study was renewed in 2001 as the Family Heart Study - Subclinical Atherosclerosis Network (FHS-SCAN) to complete analyses of genome-wide scan data and to genotype promising markers. The study expects to enroll 401 informative pedigrees (3,027 individuals) previously examined and genotyped by the NHLBI Family Heart Study to quantify coronary and aortic calcium volume in order to identify genes associated with atherosclerosis. In addition, 315 African American sibships (770 individuals) previously examined and comparably genotyped by the Hypertension Epidemiology Network (HyperGEN) will be examined at one study center to address these study questions in this minority population.