Summary
The presence of any substance other than OsO4 in osmium tetroxide fixation mixtures causes a decrease in the penetration rate of the fixative. Fixation times should therefore be prolonged whenever a fixation mixture containing osmotically active substances is used.
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Hagström, L., Bahr, G.F. Penetration rates of osmium tetroxide with different fixation vehicles. Histochemie 2, 1–4 (1960). https://doi.org/10.1007/BF00736486
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DOI: https://doi.org/10.1007/BF00736486