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Briefly, LC-MS/MS experiments were performed on an Agilent 1290 UPLC-6490 QQQ-MS system (Santa Clara, CA, USA)

Although amino acids are essential for the function of NK cells, their main role in NK cells is the maintenance of signaling (e.g., via c-Myc or mTOR) 139

However, glutathione is transported across the intestines with in its intact form [12], and its plasma concentration, along with the glutathione-derived dipeptides -glutamyl-cysteine and cysteinyl-glycine, is markedly elevated during the 60120-min period after oral administration, as shown in our previous report [13]

HPLC (High-Performance Liquid Chromatography) verifies the purity and identity of each batch