FIG. 1.

General view of the four categories of cells as defined in terms of the morphological appearance and distribution pattern of the F-actin network after staining with fluorescent β-phalloidin. (a) Category 1: small filaments (arrow) and no patches; (b) category 2: small filaments (arrow) and one or two patches (arrowhead); (c) category 3: three to six large patches (arrowheads), a decrease in the number of small filaments (large arrow), and the appearance of punctate structures (small arrow); (d) category 4: abundant punctate structures, no filaments, and fragmented patches or no patches, as here. Bars = 5 μm.