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Formation and contraction of an acto-myosin ring during yeast cytokinesis. (A) Prior to cytokinesis, actin filaments (rhodamine-phalloidin) and type II myosin (Myo1-GFP) assemble at the bud neck. (B) The actomyosin ring contracts, as demonstrated in consecutive frames of a Myo1-GFP time course at 1-minute intervals. Bar, 2 μm. (Reproduced from reference 34 by copyright permission of the Rockefeller University Press.)
