Summary
In vagotomized rats, 2 weeks after surgery, the amplitude of the circadian rhythm of plasma corticosterone was extremely low, indicating that gastrointestinal activity may be in part involved in the hypothalamo-hypophyseal circadian rhythmicity.
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Itoh, S., Katsuura, G., Hirota, R. et al. Circadian rhythm of plasma corticosterone in vagotomized rats. Experientia 37, 380–381 (1981). https://doi.org/10.1007/BF01959873
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DOI: https://doi.org/10.1007/BF01959873