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QPCR analysis of the mRNA level of clock genes in the SCN (a-d), striatum (e-h) and liver (i-l). The left side of the brain was used for QPCR analysis, n = 3 for each time point, equals to n = 12 in each group. *P < 0.05, †P < 0.01, ‡P < 0.001 for 6-OHDA group versus sham group; §P < 0.05, ||P < 0.01 for 6-OHDA group versus L-DOPA group. 6-OHDA: 6-hydroxydopamine; SCN: Suprachiasmatic nucleus; QPCR: Quantitative polymerase chain reaction.
