Fig. 3. Lamellipodia regions in mouse melanoma cells, extracted either with the Triton/glutaraldehyde mixture (1 minute; A,C) or with Triton/PEG (B). The grainy aggregates seen in (B) are typical of this extraction procedure. In C, the very front of the lamellipodium is 0.2 µm from the top edge, in the direction indicated by the arrowhead. Bar, 200 nm (A,B); 200 nm (C).