"A reader tipped me off on this recent study [I don't have electronic access to Diabetes].

Using Genetic Admixture to Explain Racial Differences in Insulin-Related Phenotypes

Barbara A. Gower, José R. Fernández, T. Mark Beasley, Mark D. Shriver, and Michael I. Goran

Diabetes 52:1047-1051, 2003

"Of the 125 children included in the study, 52 identified themselves as African American (23 boys; 29 girls), and 73 as European American(26 boys; 47 girls). individuals were considered to be of a given ethnic/racial group if both parents and all grandparents were of the same ethnicity/race as the child."

"The distribution of African ADM was from 0 to 100%. Among children who identified themselves as European American, African ADM ranged from 0 to 21% among those who identified themselves as beeing African American, African ADM ranged from 50 to 100%"