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Cystine-free/GSH-supplemented = 6

According to the subcellular localization of GSH1, the GSH synthesis initiates in the plastids, but the predominant transcript, especially in the case of multiple GSH2 transcript populations, encodes a cytosolic GSH2, suggesting the second step occurs in the cytosol (Noctor et al., 2012)

(PubMed) Schoenen J, Jacquy J, Lenaerts M

Lack of phosphatidylethanolamine N-methyltransferase alters plasma VLDL phospholipids and attenuates atherosclerosis in mice