STX4 and pancreatic insulinoma: The anatomical data were confirmed by qPCR detection of the three transcripts in both INS-1E [rat insulinoma; (ΔCT values: 15.2 (Gapdh), 20.6 (Stx4), 20.2 (Snap25), and 17.1 (Scgn)) and αTC1-6 cell lines (mouse adenoma; ΔCT values: 14.3 (Gapdh), 31.1 (Stx4), 17.9 (Snap25), and 28.0 (Scgn)].