TGFB1 and renal fibrosis: In addition, MSCs also contribute to myofibroblast recruitment in renal fibrosis via TGF‐β signaling.[57] TGF‐β type II receptor (TGF‐βR2) is the transducer of TGF‐β signaling, which recruits TGF‐βR1 and phosphorylates Drosophila mothers against decapentaplegic 2/3 (SMAD2/3).