A, Design of the Dbn targeting construct used to generate Drebrin KO mice. SA, splice acceptor; IRES, internal ribosome entry site; βgal, β-galactosidase gene; polyA, polyadenylation sequence; FRT, Flp recombinase target. B, Brain lysates from WT and Dbn−/− neonatal mice were subjected to sequential immunoblotting for Drebrin and then tubulin, as indicated. C-D, Aortas from 8-wk-old mice of the indicated genotype were subjected to X-gal staining and (C) photographed at 5× magnification or (D) paraffin-embedded, sectioned, and counterstained with eosin. E, The following mouse cells were solubilized, and 30 μg of cell protein was subjected to serial immunoblotting for Drebrin and tubulin: primary SMCs, primary endothelial cells (EC), RMA lymphoma cells (RMA), and primary macrophages (MP). F, Thirty μg of protein from WT or Dbn−/+ SMCs were immunoblotted sequentially for Drebrin and then tubulin.