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Fig. 6. Co-localization of IQGAP1 and SEPT2, and the effects of IQGAP1 depletion or overexpression on SEPT2 organization. (A) Stable expression of the IR-WW domain induces septin-filament disorganization. Immunofluorescence was performed in vector-control (upper panels) and IR-WW stable (lower panels) HeLa cells that were grown in dual-chamber slides with antibodies against SEPT2. (B) Localization of SEPT2 in IQGAP1-depleted cells. HeLa cells depleted for IQGAP1 at 100 nM and 40 nM were double-stained with anti-SEPT2 (bottom, green) and anti-IQGAP1 (top, red) antibodies.