In vitro studies on H‐2‐linked unresponsiveness to synthetic polypeptides

Abstract
The in vitro production, assay and partial characterization of an extremely potent antigen‐specific T helper cell factor to poly‐L‐(Tyr, Glu)‐poly‐DL‐Ala‐poly‐L‐Lys [(T, G)‐A–L] which may be an important physiological mediator of T cell function in vivo is described. The factor has an antigen‐binding site, Ia and Ig‐like determinants on the same molecular complex. The response to (T, G)‐A‐L is under H‐2‐linked Ir gene control, some but not all low responder haplotypes will produce the factor.