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Circadian rhythms in a fully isolated SCN neuron. A single, representative SCN neuron (white arrow) recorded before (A) and after (B) removal of all other cells. (C) PER2-driven bioluminescence from this neuron had an average period of ≈27.7 h for the last 5 days after isolation (black arrow). This SCN neuron expressed neither AVP nor VIP.
