Other studies included: the use of defined biracial pedigree cohorts as genetic models to define the possible inheritance of hypertension, hyperlipidemias, coronary heart disease, and thrombosis; maintenance of a collection of frozen sera and food; evaluating new tests to indicate differences in intravascular coagulation between racial and social class groups as related to physical activity, social mobility, and dietary deficiency; studies of the possible relationship to hypertension of dietary sodium-potassium and calcium and selenium intake.