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. 2010 Jul 12;190(1):35–43. doi: 10.1083/jcb.201004017

Figure 5.

Figure 5.

The polar actin cortex is comparatively diminished during late anaphase. (A) Live cell expressing GFP-Utr (green) and mRFP-EB3 (red) in metaphase (left) versus anaphase (right). The polar actin cortex (arrow), equatorial actin cortex (closed arrowhead), and deep actin filaments (open arrowhead) are indicated. (B) Quantification of polar versus equatorial cortical actin fluorescence (arbitrary units) in metaphase versus anaphase. Polar actin fluorescence decreases in parallel with an increase in equatorial actin before cytokinesis (P < 0.0001). (C) Successive frames of a live, MCAK-depleted cell expressing GFP-Utr and RFP-EB3. A bleb forms (asterisk), is invaded by MT ends, and widens. (D) The same cell at the onset of severe spindle rocking (arrows) is shown. (E) Kymograph of the same MCAK-depleted cell showing the temporal position of the first large bleb (asterisk). t, time; d, distance. (F) Diagram illustrating how blebs lead to rocking in MCAK-depleted cells. A small bleb forms (left) and is rapidly invaded with MT polymer, leading to a shift in the spindle position and an increase in the size of the bleb (middle). Resolution of the large bleb leads to a large reversal of the spindle position in the opposite direction (right). Error bars indicate SEM.