Early transmission electron micrograph of secretory cell from the guinea pig pancreas. Secretory granules are prominent in the lumen of the rough endoplasmic reticulum. 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: x25,000.