When cells from the pineal gland of various vertebrates are cultured in a dish under conditions of darkness, they release melatonin in a cyclic pattern. This suggests that _____.
Select the correct answer.
the pineal cells themselves have an intrinsic rhythmic property.
melatonin production varies proportionately with light and dark cycles.
melatonin production is not cyclic during daylight.
pineal tissue probably has neural connections with the hypothalamus.
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