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4.
Revealing Circadian Clock Cells and Circuits
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4.1.
The Central Clock is in the Brain
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A pseudocolor plot shows the timing of peak expression of the clock protein PER2 within cells of the suprachiasmatic nucleus in Zeitgeber Time (ZT, where ZT0 is dawn and ZT12 is dusk on a 12 hr:12 hr light:dark schedule).
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