[Elongated mitotic cells in the neuroepithelium of Xenopus laevis and Notophtalmus viridescens].

Most neuroepithelial cells in the embryos of Xenopus laevis and Notophtalmus viridescens become round upon entering into mitosis. However, many maintain their elongated form, or show long cytoplasmic processes, during mitosis. It therefore seems possible that, in these species, two groups of microtubules are present during mitosis: cytoplasmic microtubules and mitotic microtubules.