GLP-1Rs are widely distributed in several cells, such as islet cells (especially -cells of the pancreas), endothelial cells, neurons, adipocytes, keratinocytes, lymphocytes, hepatocytes, smooth muscle cells, myocytes, Brunners glands in the duodenum, and myenteric plexus neurons in the gut 31,32,33,34
The rhythmic production of melatonin, normally secreted only during the dark period of the day, is extensively used as a marker of the phase of the internal circadian clock
Regulation of the Pineal Gland and Melatonin Production Epithalon was originally developed as a synthetic analog of epithalamin, a peptide naturally produced by the pineal gland
doi: 10.3389/fimmu.2018.02069 34 ValdiviaA.LyJ.GonzalezL.HussainP.SaingT.IslamogluH.et al