Of the many marvels of the human immune system, the processing of antigens by the class I proteins of the major histocompatability complex (MHC-I) is among the most mind-boggling. Exactly how these proteins carry out their crucial functions has not been well understood. Now, however, researchers have worked out the details of key molecular interactions involved in the selection and processing of antigens by MHC-I proteins.
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Source: ScienceDaily