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γ-L-Glutamyl-L-alanine consists of γ-glutamate and alanine, and is a substrate for CRF21 (γ-glutamyl cyclotransferase, GGCT), a proteolytic breakdown product of larger proteins.γ-L-Glutamyl-L-alanine is a positive regulator of calcium-sensitive receptor (CaR) function.