1. Andersson, G., Larhammar, D., Widmark, E., Servenius, B., Peterson, P. A., and Rask, L.: Class II genes of the human major histocompatibility complex: Organization and evolutionary relationship of the DR? genes. J Biol Chem 262: 8748?8758, 1987
2. Bell, J. I., Estess, P., St. John, T., Saiki, R., Watling, D., Erlich, H. A., and McDevitt, H. O.: DNA sequence and characterization of human class II major histocompatibility complex ? chains from the DR1 haplotype. Proc Natl Acad Sci USA 82: 3405?3409, 1985
3. Böhme, J., Andersson, M., Andersson, G., Möller, E., Peterson, P. A., and Rask, L.: HLA-DR ? genes vary in number between different DR specificities, whereas the number of DQ ? genes is constant. J Immunol 135: 2149?2155, 1985
4. Brändle, U., Ono, H., Figueroa, F., and Klein, J.: Organization of the major histocompatibility complex DRB genes in the chimpanzee, submitted, 1991
5. Britten, R. J., Baron, W. F., Stout, D. B., and Davidson, E. H.: Sources and evolution of human Alu repeated sequences. Proc Natl Acad Sci USA 85: 4770?4774, 1988