In the neurotransplantation experiment by Ralph and his colleagues, the suprachiasmatic nuclei (SCN)were transplanted from the fetuses of mutant hamsters into normal adult hamsters whose sleep-wake cycles had been abolished by SCN lesions.The transplants initiated __________ sleep-wake cycles in the recipients.

Question

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The transplanted SCN from mutant hamsters, which had a 20-hour cycle, initiated 20-hour free-running sleep-wake cycles in the recipient hamsters.

In the Neurotransplantation Experiment by Ralph and His Colleagues, the Suprachiasmatic