Pineal Gland: 24-Hour Rhythm in Norepinephrine Turnover

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Science  12 Apr 1974:
Vol. 184, Issue 4133, pp. 163-165
DOI: 10.1126/science.184.4133.163


There is a 24-hour rhythm in the turnover of norepinephrine in sympathetic nerves innervating the pineal gland. This rhythm persists in blinded animals but is suppressed in normnal rats by light. The rhythm in norepinephrine turnover generates the rhythums in pineal indoleamines and N-acetyltransferase.