- Mouse platelet-derived growth factor receptor alpha gene is deleted in W19H and patch mutations on chromosome 5. Smith, E.A., Seldin, M.F., Martinez, L., Watson, M.L., Choudhury, G.G., Lalley, P.A., Pierce, J., Aaronson, S., Barker, J., Naylor, S.L. Proc. Natl. Acad. Sci. U.S.A. (1991)