PDGFRB and Hepatic fibrosis: To exclude, that the continuation of Tamoxifen injections during liver injury overestimated Cre efficiency, we also analyzed overlap of PDGFRβ-P2A-CreERT2 induced tdTomato expression and Col1a1-GFP in animals that received the last Tamoxifen injection prior to the induction of liver fibrosis by CCl4.