Early transmission electron micrograph showing an alpha cell in the Islet of Langerhans in the guinea pig pancreas. Alpha granules are prominent among the mitochondria, and a portion of nucleus is also present. Image made available by James D. Jamieson and the Department of Cell Biology, Yale University School of Medicine.
Original 3.25 in. x 4 in. lantern slides were scanned at 600dpi. Original Magnification: 3,500.