Characterization of GDF11 signalling through type I and type II receptors. Characterization of GDF11 signalling through type I and type II receptors. Gene reporter assays in (A) HepG2 and (B,C) R4‐2 cells. The results are relative luciferase activity of triplicate determinations ±s.d. A2a, Acvr2; A2b, Acvr2b; BRII, bone morphogenetic protein type II receptor; GDF11, growth differentiation factor 11; TβII, transforming growth factor‐β type II receptor. Olov Andersson et al. EMBO Rep. 2006;7:831-837 © as stated in the article, figure or figure legend