Definition: a proposed pathway for the glutathione-dependent transport of certain amino acids (most notably l-cystine, l-methionine, and l-glutamine) and dipeptides into certain cells; this cycle requires the formation of ?-glutamyl amino acids and ?-glutamyl dipeptides as well as a protein for the translocation of these di- and triisopeptides into the cells.
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Examples: glitazone, GI cocktail, etc.