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- W1848034140 abstract "The tam 8 mutant of Paramecium tetraurelia is a representative of a class of mutants characterized by abnormal nuclear divisions during binary fission and the failure of trichocysts to attach to the plasma membrane. Compared with wild-type organisms the following abnormalities occur in tam 8 individuals. (I) The spherical interphase macronucleus is not positioned near the oral apparatus; it is randomly located in the cytoplasm of interfission organisms. (2) The macronucleus does not migrate towards the anterior dorsal cortex as its division starts, nor is it dorsally and subcortically positioned as it elongates. (3) Elongating macronuclei exhibit variable and irregular shapes. (4) This elongation is delayed and reduced. (5) Longitudinally oriented microtubules assemble in the nucleoplasm of dividing macronuclei but their spatial deployment is abnormal. (6) Unequal segregation of micronuclei between daughter organisms occurs during binary fission. The abnormal arrangement of nucleoplasmic microtubules provides support for the proposal that a microtubule sliding mechanism is involved during the elongation of dividing macronuclei. The extent to which macronuclear division may be controlled by the cell cortex is considered in relation to tthe pleiotropic effects of the tam 8 mutation." @default.
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- W1848034140 date "1980-08-01" @default.
- W1848034140 modified "2023-09-26" @default.
- W1848034140 title "Abnormal microtubule deployment during defective macronuclear division in a <i>Paramecium</i> mutant" @default.
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- W1848034140 doi "https://doi.org/10.1242/jcs.44.1.153" @default.
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