Btk is required for an efficient response to erythropoietin and for SCF-controlled protection against TRAIL in erythroid progenitors. by Schmidt, U, van den Akker, E, Parren-van Amelsvoort, M, Litos, G, De Bruijn, M, Gutiérrez, L, Hendriks, R, Ellmeier, W, Löwenberg, B, Beug, H, von Lindern, M