Co-localization of insulin, glucagon, and Nampt.

<p>Immunofluorescence image of an islet from an adult male stained for insulin, glucagon and Nampt. <b>A:</b> insulin staining (beta cells) using anti-insulin antibody (green). <b>B:</b> Glucagon was identified in the same islet (alpha cells) using anti-glucagon antibody (blue). <b>C:</b> Nampt was identified in the same islet using anti-Nampt antibody (red) and is found in both the islet and surrounding exocrine tissue. <b>D:</b> Overlap of all 3 images shows that the majority of Nampt co-localizes with insulin in beta cells.