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Rhythmic expression of mPer1 and mPer2 hybridization signal in hamster SCN. Representative film autoradiographs of the mPer1 (a–c) and mPer2 (d–f) hybridization signals generated from adjacent coronal sections of the Syrian hamster brain, sampled at ZT 4 (a and d), ZT 20 (b and e), or ZT 24 (c and f). Note the widespread, constitutive expression in most sites, but the pronounced daily rhythm of expression in the SCN, marked by arrow in a.
