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Glutamine, the second-most abundant FAA, shows the highest relative increase in concentration, increasing almost 350% from month 1 to 6 of lactation and reaching a concentration of up to 0.6 mM (35, 64, 75)

However, if cysteine is deficient, then -glutamyl cysteine cannot be formed and instead the -glutamyl phosphate will autocyclize to become 5-oxoproline (Figures 4B and 5)

doi: 10.1016/j.phrs.2022.106401

Recent findings have indicated that the inhibition of glutamine metabolism in cancer cells results in an enhancement of glycolysis, a process that is facilitated by metabolic repair and immune evasion induced by up-regulated PD-L1 [220]