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But every level of that progression matters, and skipping steps or delaying entry doesn't lead to better outcomes it leads to worse ones

J Clin Invest 113(1):2527

Cancer Biol Med (2020) 17(1):15468

who demonstrated degenerative disc changes after mean 3.4 years in 8 patients, all being older than 15 years

The first step is likely catalyzed by glutamatecysteine ligase (Gcs1), which catalyzes the condensation of Cys and glutamate to form -glutamylcysteine, which is then converted to GSH by the addition of Gly to the C-terminal of -glutamylcysteine by glutathione synthase (Gsh2) ( the source of 4-phosphopantetheine for essential post-translational activation of non-ribosomal peptide synthetases and polyketide synthases in fungi (Stack et al., 2009