21 Further, it has been shown that an increased rate of glutamine entry leads to increased intracellular accumulation of glutamate
An alternative explanation, which could potentially explain both sets of experiments, is that exported GSH is broken down into constituent amino acids in the blood that are rapidly reimported into the liver cells
Pubmed Central PMCID: 2989686
Single-cell proteomics reveals changes in expression during hair-cell development

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