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CIL:12641*  Cite 

High resolution image of a monoclonal antibody raised in mouse to an antigen called C6 found on the surface of Paramecium. As seen in this micrograph the gold labelled antigen heavily labels the ciliary membrane and cell surface. In addition the gold is found in the parasomal sacs, in preendosomal vesicles and in early endosomes. However, there is almost no gold in the small coated evaginations of the early endosome or in the carrier vesicles escaping from the early endosomes. We conclude that this antigen passes no further into the cell and is recycled back to the plasma membrane. This antigen could be a cargo receptor that is cycled between the plasma membrane and the early endosome. The cargo may fall off this receptor in the early endosome and be concentrated in the small coated evaginations as is HRP for transport deeper into the cell. TEM taken on 5/14/91 by R. Allen with Zeiss 10A operating at 80kV. Neg. 12,000X. Adapted with permission from J. Cell Sci. 101:449-461, 1992. Cells were lightly fixed with 0.25% glutaraldehyde and infiltrated with 2.3M sucrose before being frozen in liquid nitrogen and thin sectioned at a temperature of –100°C at approximately 75nm thickness. Frozen sections from these preparations were then thawed, washed, and exposed to a monoclonal primary antibody that was raised in mice or rabbit/goat and to colloidal gold-complexed goat-anti-mouse/rabbit secondary antibodies. Further details of preparation are outlined in Methods Cell Biol. 2010;96:143-73. The raw film was scanned with an Epson Perfection V750 Pro. This image is best used for quantitative analysis. Additional information available at (

Biological Sources
NCBI Organism Classification
Paramecium multimicronucleatum
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
plasma membrane
early endosome
Biological Context
Biological Process
endosome organization
endosome to lysosome transport
Richard Allen (University of Hawaii)
J. Cell Sci. 101:449-461
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
transmission electron microscopy (TEM)
illumination by electrons
Image Mode
detection of electrons
Parameters Imaged
electron density
Source of Contrast
intrinsic mass distribution
stain with broad specificity
Visualization Methods
stain with broad specificity
uranyl salt
Processing History
recorded image
Print from negative scanned for Photoshop.
Data Qualifiers
processed data
Sample Preparation
glutaraldehyde fixed tissue
tissue in vitreous ice embedment
microtome-sectioned tissue
monoclonal antibody
Relation To Intact Cell
microtome-sectioned tissue
Spatial Axis Image Size Pixel Size
X 4862px 1.25nm
Y 4714px 1.25nm