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This study identified a new enzyme, skin l‐tryptophan‐2,3‐dioxygenase, that may play a role in rat hair growth regulation, showing increased activity during peak hair growth periods.

This review summarizes proposed pathophysiological mechanisms of postpartum depression, highlighting neuroendocrine and neurobiological changes, but reports no new findings and calls for integrated understanding of the disorder.

This review discusses how environmental factors like lifestyle, nutrition, and vitamin deficiencies may influence autoimmune diseases such as MS, SLE, and AA, highlighting associations with vitamin D levels and dietary interventions, but notes a lack of conclusive evidence for their roles in disease pathogenesis.

This study provides evidence that human skin contains genes and enzymes necessary for producing serotonin and melatonin.

This review provides a comprehensive overview of melatonin's physiological roles, effects, and clinical implications, but it does not present new experimental findings.