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J. Cell Biol.,
Volume 143, Number 3, November 2, 1998 687-694

* Department of Physiology and The mitotic spindle is a complex and dynamic structure. Genetic analysis in budding yeast has
identified two sets of kinesin-like motors, Cin8p and
Kip1p, and Kar3p and Kip3p, that have overlapping functions in mitosis. We have studied the role of three
of these motors by video microscopy of motor mutants
whose microtubules and centromeres were marked
with green fluorescent protein. Despite their functional
overlap, each motor mutant has a specific defect in mitosis: cin8
Department of Biochemistry, School of Medicine, University of California San Francisco, San
Francisco, California 94143
mutants lack the rapid phase of anaphase
B, kip1
mutants show defects in the slow phase of
anaphase B, and kip3
mutants prolong the duration of
anaphase to the point at which the spindle becomes
longer than the cell. The kip3
and kip1
mutants affect the duration of anaphase, but cin8
does not.
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