Summary
Rabbit pineal HIOMT activity shows a diurnal rhythm. The highest values are observed at night and the lowest during the daytime.
Animals kept in permanent darkness show higher values than those in constant light. Bilateral superior cervical ganglionectomy results in a tenfold decrease in pineal HIOMT activity.
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de Gallardo, M.R.G.P., Tramezzani, J.H. Hydroxyindole-O-methyl-transferase activity in the pineal gland of the rabbit. J. Neural Transmission 36, 51–57 (1975). https://doi.org/10.1007/BF01243437
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DOI: https://doi.org/10.1007/BF01243437