Butty, V., Roy, M., Sabeti, P., Besse, W., Benoist, C., & Mathis, D. (2007). Signatures of strong population differentiation shape extended haplotypes across the human CD28, CTLA4, and ICOS costimulatory genes. National Academy of Sciences.

Butty, Vincent, Matt Roy, Pardis Sabeti, Whitney Besse, Christophe Benoist, and Diane Mathis. Signatures of Strong Population Differentiation Shape Extended Haplotypes Across the Human CD28, CTLA4, and ICOS Costimulatory Genes. National Academy of Sciences, 2007.

Butty, Vincent, et al. Signatures of Strong Population Differentiation Shape Extended Haplotypes Across the Human CD28, CTLA4, and ICOS Costimulatory Genes. National Academy of Sciences, 2007.