To throw down the gauntlet
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RF n 1: a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland [syn:
] 2: a radioactive transuranic element which has been synthesized [syn:
atomic number 104
] 3: a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone [syn:
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