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Quantitation of changes in cell shape using computerized image analysis demonstrated that PDGF doubled the total projected area of lamellipodia formed by each cell within 5 min of addition and increased it by almost 10-fold at 30 min (Fig. 3 â A).o determine relative changes in lamellipodia length in different regions of the cell, corners were defined as parts of the square perimeter within 6 Î¼m from the intersection of the two sides; sides were defined as the 18 Î¼m interval between these corner regions.
âMuller and Westheide found the innervation pattern of myzostomid parapodia and marginal cirri to be identical to that of polychaete parapodia and cirri.â âMating status was easily established by inserting a finger between parapodia to determine if adjacent animals were linked by an extended penis.â âSubsequently work on a brittle star showed expression of the gene in the tube feet, and many found it difficult to equate the tube feet of echinoderms with the parapodia of polychaetes or the arthropod limb.â âThe Polychaeta lack a clitellum and have parapodia, paddle-like appendages with numerous bristles or chaetae.â