Specifically, NAC is a derivative of the amino acid L-cysteine, an essential precursor used by the body to produce glutathione
Amide refers to an amine where one of the nitrogen substituents is an acyl group that is a derivative of a carboxylic acid
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When concentrations of this amino acid are too low, deficiency can develop
Taken together, these elaborate mechanisms highlight the UPR not as a uniform survival pathway but as a dynamic, branch-specific signaling network whose outputs depend on tumor type, microenvironment, and stress duration
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