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The rate at which (3)H-norepinephrine disappears from rat braint increases after gonadectomy; the effect is observed 6 days after the operation and 24 hours after introduiction of the labeled mnaterial; it is not reprodluced by hypophysectomy. The content of endogenouis brain norepinephrinie does not decline after removal of the ovaries or testes; thus synlthesis of the catecholamine is probably increased by these procedures.
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Antón‐Tay et al. (1968) studied this question.
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