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Its defining structural feature is the gamma-glutamyl linkage: the glutamate residue is joined through its side-chain carboxyl rather than the usual alpha-peptide bond, which makes the molecule resistant to most intracellular peptidases and means it is cleaved almost exclusively by gamma-glutamyl transpeptidase at the outer cell surface (Zhang, Forman and Choi, Methods in Enzymology, 2005)
SUMMARY Spinach is low in carbs but high in insoluble fiber
PMC 2878077
Protects neurons by improving mitochondrial function
5 , eabd7114 (2020)
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