- Linkage between the gene (or genes) controlling synthesis of the fourth component of complement and the major histocompatibility complex. Ochs, H.D., Rosenfeld, S.I., Thomas, E.D., Giblett, E.R., Alper, C.A., Dupont, B., Schaller, J.G., Gilliland, B.C., Hansen, J.A., Wedgwood, R.J. N. Engl. J. Med. (1977)