Fig. 7. Effect of PDGF-BB on microfilament reorganization, as revealed by phalloidin staining. Quiescent mesonephric mesenchymal cells (A) were stimulated for 15 minutes (B) with PDGF-BB (10 ng/ml). Note that treated cells exhibit a rapid change in microfilament reorganization and in cellular morphology (phalloidin staining at the leading edge of the cell and extensions of lamellipodia). Bar, 20 µm.