WASL and infection: We thank A. Bright for help with infections of N-WASP-deficient cells, K. Rottner for helpful discussion and for providing N-WASPdel/del mouse embryo fibroblasts, M. Kirschner and S. Rankin for anti-N-WASP antibodies, R. Isberg for anti-Arp3 antibodies, A. Poteete for the bacterial GFP expression plasmid, Barbara Trask for GFP-WASH expression plasmid, and J. Peterson, J. Goguen, and D. Tipper for helpful discussion.