Personal genomics also stands to remedy troubles that come when drugs are prescribed based on skin color. Take the controversial drug BiDil, which is targeted to African-Americans at risk of heart disease. Critics of BiDil say its developer, NitroMed, overlooked social influences on the rate of hypertension in people of African descent. Furthermore, as the Venter vs. Watson bout showed, individual variation is no small factor—especially when you consider that two people of the same racial group can differ more on a genetic level than two people of different races. "One's ethnicity/race is, at best, a probabilistic guess at one's true genetic makeup," write the Venter Institute study authors.