Fig. 1. Phase-contrast images of keratocytes from G. mirabilis display the range of variation observed in keratocyte morphology. Morphological features include: (A) stereotypical `canoe shape', (B) small ruffling at the leading edge, (C) ruffling at the edges of the cell and (D) large, phase-dense ruffles in the forward third of the lamellipodium. Scale bar, 10 µm.