Salomonsen, Jan, Sørensen, Maria Rathmann, Marston, Denise A, Rogers, Sally L, Collen, Trevor, van Hateren, Andrew, Smith, Adrian L, Beal, Richard K, Skjødt, Karsten and Kaufman, Jim (2005) Two CD1 genes map to the chicken MHC, indicating that CD1 genes are ancient and likely to have been present in the primordial MHC. Proceedings of the National Academy of Sciences of the United States of America, 102 (24). pp. 8668-73.