- The RhoGAP activity of OPHN1, a new F-actin-binding protein, is negatively controlled by its amino-terminal domain. Fauchereau, F., Herbrand, U., Chafey, P., Eberth, A., Koulakoff, A., Vinet, M.C., Ahmadian, M.R., Chelly, J., Billuart, P. Mol. Cell. Neurosci. (2003)