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Anaphase B. Rat kangaroo PtK1 cells fixed at mid (A) and late (B) stages of spindle elongation and prepared as in Figure 2. ipMTs are the interpolar microtubules, which interdigitate at the spindle midplane. These elongate by sliding and the addition of tubulin at the sites indicated by white arrows. CF, cleavage furrow; CHRs, chromosomes. Scale bars, 1 µm. (Images kindly provided by Mary Morphew, University of Colorado, Boulder.)
