- Diminished levels of the putative tumor suppressor proteins EXT1 and EXT2 in exostosis chondrocytes. Bernard, M.A., Hall, C.E., Hogue, D.A., Cole, W.G., Scott, A., Snuggs, M.B., Clines, G.A., Lüdecke, H.J., Lovett, M., Van Winkle, W.B., Hecht, J.T. Cell Motil. Cytoskeleton (2001)