Despite conflicting studies,36, 37 the majority of reports on the subject suggest that CB1Rs are present in pancreatic β cells.10, 11, 15, 23, 24, 38, 39 Western blot analysis confirmed that CB1Rs are expressed in mouse insulinoma cell lines (βTC6 and MIN6 cells) but are lacking in CHO cell lines (CHO‐K1 and CHO‐GLP‐1R) stably transfected with vector and GLP‐1R 32 (Figure 1A). This evidence concerns the gene GLP1R and pancreatic insulinoma.