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Long-term effects of calorie or protein restriction on serum IGF-1 and IGFBP-3 concentration in humans

This dynamic is supported by research using Mdr1a/b knockout mice, which lack functional P-gp and show increased brain concentrations of drugs such as risperidone (167), highlighting critical role of P-gp in modulating CNS drug access

Glutathione is found in virtually every cell of the body and plays a critical role in protein synthesis, enzyme function, transport, and cell maturation*

It is found in every cell with particularly high concentrations in the liver, spleen, kidney, eye-lens, erythrocytes, and leukocytes

Thus, glutamine entry into the TCA cycle can provide metabolic intermediates for NRF2-regulated NADPH-producing enzymes, such as IDH1 and ME1