To inhibit Rac1 activity, cells were treated for 60–120 min with Rac1 inhibitor NSC23766 (50 μM; Bio-Techne Corporation, Minneapolis, MN) or microinjected with recombinant dominant-negative mutant Rac1 protein (Ridley et al., 1992
) (needle concentration 5 mg/ml) as described in Waterman-Storer et al. (1999)
.
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