- ABI2-deficient mice exhibit defective cell migration, aberrant dendritic spine morphogenesis, and deficits in learning and memory. Grove, M., Demyanenko, G., Echarri, A., Zipfel, P.A., Quiroz, M.E., Rodriguiz, R.M., Playford, M., Martensen, S.A., Robinson, M.R., Wetsel, W.C., Maness, P.F., Pendergast, A.M. Mol. Cell. Biol. (2004)