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Fig. 4. Hsp27-P is depleted from the leading edge. (A) Suspended SMC were incubated for 30 minutes with 25 µM SB203580 or vehicle and then plated on fibronectin-coated coverslips for 3 hours in the presence or absence of PDGF (10 ng/ml). Fixed SMC were double-labeled for F-actin and Hsp27. Bar, 10 µm. (B) Suspended SMC were plated on fibronectin-coated coverslips for 3 hours in the presence of PDGF. Fixed SMC were double-labeled for F-actin and Hsp27 or Hsp27-P. Bar, 5 µm. These results are representative of three independent experiments.