Monoclonal antibodies GFP 3E1 (Cancer Research UK), Actin AC-74 (Sigma), and zyxin 164D4 (SySy) as well as rabbit antibodies against Abi1 (Sigma A5106) and VASP (Cell Signaling 3132S) were used. Antibodies against human Abi1, Nap1, and PIR121 (Steffen et al., 2004 (link)) were kindly provided by Dr Theresia Stradal (University of Muenster, Germany). Antibodies against Drosophila Abi and WAVE have been described (Bogdan et al., 2005 (link), Stephan et al., 2011 (link)). Immunofluorescence and immunoblot analyses were performed as described (Boëda et al., 2007 (link)). Projection patterns of all photoreceptor axons of the indicated genotypes were depicted using mouse anti-24B10 (α-Chaoptin, DSHB; Stephan et al., 2011 (link)).
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