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Rac induces integrin clustering. RacV12,N33 (c to f)- or vector DNA (a and b)-transfected cells were seeded on fibronectin-coated coverslips, fixed, and stained with either anti-α4 (a and c) or anti-α5 (e) antibodies or with rhodamine phalloidin (b, d, and f) to visualize actin organization. Bars = 10 μm.
