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Karyokinesis

Definition: The indirect division of cells in which, prior to
division of the cell protoplasm, complicated changes take place in the
nucleus, attended with movement of the nuclear fibrils; -- opposed to
karyostenosis. The nucleus becomes enlarged and convoluted, and finally
the threads are separated into two groups which ultimately become
disconnected and constitute the daughter nuclei. Called also mitosis.
See Cell development, under Cell.