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| a period of sleep during which most dreaming occurs as the eyes move under closed lids and the skeletal muscles are deeply relaxed |
| the movement of an organism in response to a stimulus such as light |
chalone cha·lone (kā'lōn', kāl'ōn')
n.
A hormone that inhibits rather than stimulates.
Any of several polypeptides produced by a tissue and causing the reversible inhibition of mitosis in cells of that tissue.