Abstract
Cortical microtubules and cortical microfilaments were visualized in cells ofMicrasterias pinnatifida treated by freeze-substitution, and the pattern of their distribution was reconstructed from serial sections. Most cortical microtubules accompanied the long microfilaments that ran parallel to the microtubules. Cortical microfilaments not accompanied by the microtubules were also found. They were short and slightly curved. Both types of cortical microfilament were not grouped into bundles, and were 6–7 nm in diameter, a value that corresponds to the diameter of filaments of F-actin.
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