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Fig. 3. Transitory spindle poles during spindle formation in the incenp
mutant. A time lapse sequence of spindle formation after nuclear envelope
breakdown to metaphase I in wild type (A) and the
incenpQA26 mutant (B). Time zero indicated the
first appearance of spindle microtubules (arrowheads) around the chromosomes.
At 10:12 in the mutant, an ectopic pole (arrow) was formed around the spindle
equatorial region and eventually merged with one of the poles. Scale bar: 10
µm.