Transmission electron micrograph of a thin section of rat pancreas showing a high magnification view of rough (granular) endoplasmic reticulum. Membrane-bounded cisternae are studded with ribsomes which, in favorable views show a cleft between the large and small subunits, with the large subunit connecting the membrane.
Original 3.25 in. x 4 in. lantern slides were scanned at 600dpi
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