Figure 3 Regulation of TGF-β1/Smad signalling by microRNAs (miRs) in tissue fibrosis Figure 3 | Regulation of TGF-β1/Smad signalling by microRNAs (miRs) in tissue fibrosis. Numerous miRs have been implicated in the regulation of tissue fibrosis, particularly kidney fibrosis. miRs are grouped as having an antifibrotic effect (purple), profibrotic effect (pink) or both profibrotic and antifibrotic effects (blue). Whether TGF-β1/Smad3 signalling positively or negatively regulates the transcription of these miRs is indicated, and the target genes inhibited by the miRs are shown. Meng, X.-m. et al. (2016) TGF-β: the master regulator of fibrosis Nat. Rev. Nephrol. doi:10.1038/nrneph.2016.48