Prothoracic glands of the saturniid moth Samia cynthia ricini possess a circadian clock controlling gut purge timing.

@article{Mizoguchi1982ProthoracicGO,
  title={Prothoracic glands of the saturniid moth Samia cynthia ricini possess a circadian clock controlling gut purge timing.},
  author={Akira Mizoguchi and Hironori Ishizaki},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1982},
  volume={79 8},
  pages={2726-30}
}
In the moth Samia cynthia ricini, timing of the release of prothoracicotropic hormone is controlled by a circadian clock in the cephalic organ (brain); while this hormone release is necessary for gut purge, the final timing of this event is controlled by a circadian clock in the prothoracic glands that gates release of ecdysone. The photoreceptor of the prothoracic gland clock(s) is extraocular and evidently in the glands themselves. Demonstration that the clock and its photoreceptor are in the… CONTINUE READING

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