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Fig. 7. Mitotic cytoplasmic astral microtubules behave like cytoplasmic interphase bundles. This kymograph is from a time-lapse movie of astral microtubule growth and shrinkage during anaphase B. It shows there are multiple microtubules in a bundle (arrow). Each individual microtubule only undergoes one growth and catastrophe cycle. SPB, spindle pole body. Bar, 2 µm.