Actin is the most abundant protein in the giant oocyte nucleus of the frog Xenopus. It reaches this high concentration because the oocyte lacks exportin-6, a nuclear export factor that specifically pumps actin out of other nuclei. What effect actin has on the physical properties of the oocyte nucleus is a matter of ongoing debate.
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Gall, J. Exporting actin. Nat Cell Biol 8, 205–207 (2006). https://doi.org/10.1038/ncb0306-205
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DOI: https://doi.org/10.1038/ncb0306-205
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