 A study of a sample of 96 healthy self-identified White Puerto Ricans and self-identified Black Puerto Ricans in the U.S. showed that, although all carried a contribution from all 3 ancestral populations (European, African, and Amerindian), the proportions showed significant variation.Depending on individuals, although often correlating with their self-identified race, African ancestry ranged from less than 10% to over 50%, while European ancestry ranged from under 20% to over 80%.Amerindian ancestry showed less fluctuation, generally hovering between 5% and 20% irrespective of self-identified race.