RT-PCR analysis showed mRNA expression of GLP-1R and glyceraldehyde-3-phosphate dehydrogenase (GAPDH; a housekeeping gene used for confirmation of the proper reactions) in DRG neurons and IFRS1 cells, as well as NSC-34 cells [15] and ND7/23 mouse neuroblastoma/rat embryonic DRG neuron hybrid cells [18] (Figure 1a). Here, GLP1R is linked to neuroblastoma.