PDGFRB and Hepatic fibrosis: As we achieve a high recombination of PDGFRβ-P2A-CreERT2 in retinoid positive HSCs of over 90% and a similarly high percentage of pericyte derived myofibroblasts in three different liver fibrosis models, the inducible PDGFRβ-P2A-CreERT2 model can be used once an inducible Cre mouse model for liver mesenchymal cell populations is required with a similar efficiency as the constitutive PDGFRβCre7 or the well accepted LratCre transgenic mouse model3.