Summary
During a survey of liver tissue from 100 dogs, fine tubules were observed within the cisternae of the endoplasmic reticulum of hepatocytes in one dog. The tubules were 300 Å in diameter with electron dense walls of 100 Å thickness. Many cells contained the tubules but their significance is unknown. The tubules varied from other reported microtubules in their location, size and characteristics of fixation and staining.
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Richter, W.R., Bischoff, M.B. & Churchill, R.A. An observation of fine tubules within the endoplasmic reticulum in a dog liver. Zeitschrift für Zellforschung 70, 180–184 (1966). https://doi.org/10.1007/BF00335672
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DOI: https://doi.org/10.1007/BF00335672