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This issue warrants deeper consideration
Liver histology Liver tissue was fixed overnight in 10% formaldehyde, transferred to 70% ethanol for 48 h and then processed into paraffin blocks
Yuan et al., 2016)
Melatonin is mainly produced during the dark phase, and the maximal plasma concentration of this serotonin-derived hormone usually occurs 45 h after darkness onset 11
Barreiro, E., Gea, J., Corominas, J
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