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Fig. 7. Rapid contractions (`twitches') occur simultaneously in distinct regions of
the choanosome after uptake of inedible ink. (A) Projected area (density of
the tissue) was measured as a proxy for the extent of contraction of the
tissue; a contraction was observed as a decrease in the area occupied by
tissue (a decrease in blackness). (B) The change in projected area of each
region shows that two contraction events occur within seconds of each other in
Areas I and II of A, 700 µm apart. (Movie 2 in supplementary material.)
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