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The pineal hormone derived from tryptophan that helps set circadian rhythm is:

AMelittin
BMelatonin
CMelanin
DMelamine
Answer & Solution
Correct answer: B. Melatonin
1. It is secreted by the pineal gland. 2. It regulates the daily sleep and wake cycle. 3. That hormone is melatonin. _Source: OpenStax Anatomy and Physiology 2e, Chapter 17, The Endocrine System._
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