Evaluation of somatostatin receptor subtypes (sstr1-5) in representative insulinomas from Pdx1-Cre:Men1 floxed/floxed conditional knockout mice by immunofluorescence. Islets of Langerhans were visualized with anti-insulin antibody and corresponding secondary antibody (red), and sstr1-5 were identified with anti-sstr1, - sstr2, -sstr3, -sstr4, or -sstr5 antibodies along with corresponding secondary antibodies (green). All 5 sstr were identified in this mouse model.