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*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:7603*  Cite 

Morphology of the endoplasmic reticulum during a period of rapid cell differentiation. This micrograph shows two typical patterns of rough endoplasmic reticulum (RER) in developing liver from a one day old rat. Some RER is arranged in arrays of parallel flat cisternae (shown here in cross-section) and other RER (cisternae and/or tubules) encircles the mitochondria (Mt). The RER is defined by the presence of bound ribosomes (RiB). Many free ribosomes (RiF) are also seen in the cytoplasm between the parallel arrays of RER. Identical labeled image available as CIL# 7605. Similar to micrographs published in Dallner G, Siekevitz P, Palade GE. J Cell Biol. 1966;30:73-96. Original image is in the Palade Collection, University of California, San Diego.

Technical Details

Small blocks of rat liver tissue were fixed in 2% glutaraldehyde in 0.1 M phosphate buffer, pH 7.4 for 3 hours at 0C and postfixed in 1% osmium tetroxide in the same buffer for 15 hours at 0C. The tissue was dehydrated and embedded in Epon. Sections were stained for 1 minute with uranyl acetate and with alkaline lead citrate for 5 minutes and finally examined in a Siemens Elmiskop I operated at 80 kv with a double condensor and 50µ apertures in the objective lens. 3.25 X 4 inch lantern slide scanned at 1200 dpi in TIFF format, then reduced to 600 dpi TIFF file (3500 x 2969 pixels) prior to conversion to JPEG2000 format. Original image created on September 23, 1965.

Biological Sources
NCBI Organism Classification
Rattus rattus
Cell Type
Cellular Component
rough endoplasmic reticulum
cytosolic ribosome
Biological Context
Biological Process
biosynthetic process
George E. Palade (University of California, San Diego)
Dallner et al. 1966
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
Image Mode
transmission electron microscopy (TEM)
Parameters Imaged
electron density
Source of Contrast
differences in adsorption or binding of stain
Visualization Methods
lead salt
uranyl salt
Processing History
unprocessed raw data
Data Qualifiers
raw, unprocessed data
Spatial Axis Image Size Pixel Size
X 4800px 42.33µm
Y 4072px 42.33µm