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Describe the selectivity of the potassium ion channel.
Melatonin
A substance secreted by the pineal gland that controls the circadian rhythms.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles.
Sleep
A natural, reversible state of reduced responsiveness to external stimuli, essential for human health and well-being.
Positive Outlook
An optimistic attitude that focuses on expecting good and positive outcomes.
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