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Pineal gland
Pineal gland
Pineal gland
the pineal gland
Pineal gland
i believe it is pituitary gland not 100% sure
The eggThe caterpillarThe chrysalis The butterfly
Tropin
Pineal body (gland)
hypothalamus
Pineal body (gland)
The hormone melatonin, which is secreted by the pineal gland.