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Fig. 5. The density of filopodia changes during three discrete phases associated with pseudopod extension in response to a spatial gradient of chemoattractant emanating from an aggregation stream. In this case, filopodial number was monitored during extension of pseudopod c of the cell in Fig. 2. (A) Filopod number per pseudopod c. (B) Filopod number per µm of pseudopod c unit length. Pseudopodia of four additional cells turning towards a stream exhibited similar pseudopod and filopod dynamics. Note that filopodia are dense during phase two, but decrease in density in phase three.
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