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[PMC free article: PMC6201603] [PubMed: 30374398] 15
Certain peptides help regulate the bodys circadian rhythm, ensuring deeper and more restorative sleep

This is a very important and possibly crucial biochemical mechanism, since reversible thiolation of proteins can modify their enzymatic activities (glycolytic enzymes, components of the respiratory chain, creatine kinase, carbonic anhydrase), ion and metabolite transport, gene transcription, signal transduction and cell death
