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

CIL:7723*  Cite 

Four centrioles imaged in one electron micrograph of a thin section, cut from a Chinese hamster fibroblast grown in tissue culture. The two centrioles that appear circular are the 'mother' centrioles, in the sense that they are older, while the two in longitudinal section, which appear rectangular, are 'daughters.' They were initially formed only hours earlier as this cell began the S-phase of its cell cycle, and they are not yet fully mature. The mother centrioles bind 'pericentriolar material', which initiates the growth of microtubules. As the cell enters mitosis, the two pairs of centrioles will separate, so one mother and one daughter centriole will be situated at each pole of the growing mitotic spindle. Thus, each daughter cell will inherit two centrioles, each of which can help to organize the formation of a daughter centriole during the subsequent S-phase, so the cycle can continue. While the centriole cycle was initially described by classical light microscope cytology, this organelle is so small in most cells that details of its duplication were almost invisible. Electron microscopy provided the space resolution necessary to see what centrioles really looked like and to characterize the process of their duplication cycle. This micrograph captured in a single image all four of the centrioles in a cell that was about to enter mitosis and provided a clear demonstration of the spatial relationships among them. Other work at about the same time revealed aspects of the process by which multiple centrioles formed in cells that were differentiating to make the many basal bodies necessary to form the cilia the coat the free surface of some epithelial cells. Image originally appeared in: McGill M et al. J Ultrastruct Res. 1976;57:43-53.

Technical Details

Chinese hamster fibroblasts were cultured in McCoy's medium supplemented with 20% fetal calf serum. They were rinsed with phosphate buffer then fixed for one hour with 1% OsO4 in the same buffer. They were then stained with uranyl acetate, dehydrated in an ethanol series, embedded in epoxy resin, sectioned, and imaged with an electron microscope operating at 60 KeV. Original resource provided by Keith R Porter Archives (University of Maryland Baltimore County, Baltimore, MD). Still image jp2; 3x4 inch lantern slide.

Biological Sources
NCBI Organism Classification
Cricetulus griseus
Cell Type
Cellular Component
pericentriolar material
Biological Context
Biological Process
centriole replication
Manley Mcgill
D.P. Highfield
T.M. Monahan
B.R. Brinkley
J Ultrastruct Res. 1976. 57: 43-53
Keith R Porter Archives (University of Maryland Baltimore County)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Image Type
Image Mode
transmission electron microscopy (TEM)
detection of electrons
illumination by electrons
Parameters Imaged
electron density
Source of Contrast
differences in adsorption or binding of stain
Visualization Methods
uranyl salt
Processing History
digitized lantern slide
Data Qualifiers
processed data
suitable for spatial measurements
Spatial Axis Image Size Pixel Size
X 4500px 42.3333µm
Y 3126px 42.3333µm