Using flow cytometry energy transfer we have studied the sterical proximity of interleukin 2 receptors and the heavy chain of the major histocompatibility complex at the surface of normal lymphocytes. Our data suggest that class I molecules may be part of a low-affinity interleukin 2 receptor multimolecular complex, where the MHC class I heavy chain is in close proximity to the actual interleukin 2 binding site, in contrast to the light chain (beta 2-microglobulin).

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