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Fig. 9. Abrogation of Abr and Bcr causes increased levels of RacGTP. RacGTP was affinity-precipitated from lysates using GST-PAK (top panel). Levels of total Rac and RacGTP were evaluated using western blotting with anti-Rac antibodies. The lower panel represents the quantitation of scanned images. When compared with two wild-type controls, non-stimulated monocytes from two independent Abr-/-;Bcr-/- mutants showed approx. threefold higher levels of RacGTP.