- Direct evidence for the existence of nominal antigen binding sites on T cell surface Ti alpha-beta heterodimers of MHC-restricted T cell clones. Siliciano, R.F., Hemesath, T.J., Pratt, J.C., Dintzis, R.Z., Dintzis, H.M., Acuto, O., Shin, H.S., Reinherz, E.L. Cell (1986)