- TWEAK, via its receptor Fn14, is a novel regulator of mesenchymal progenitor cells and skeletal muscle regeneration. Girgenrath, M., Weng, S., Kostek, C.A., Browning, B., Wang, M., Brown, S.A., Winkles, J.A., Michaelson, J.S., Allaire, N., Schneider, P., Scott, M.L., Hsu, Y.M., Yagita, H., Flavell, R.A., Miller, J.B., Burkly, L.C., Zheng, T.S. EMBO J. (2006)