- No evidence for an association between genetic polymorphisms of beta(2)- and beta(3)-adrenergic receptor genes with body mass index in Aymara natives from Chile. Santos, J.L., Pérez-Bravo, F., Martínez, J.A., Montalvo, D., Albala, C., Carrasco, E. Nutrition (Burbank, Los Angeles County, Calif.) (2002)