TGFB1 and Hepatic fibrosis: TGF‐β1 is a key pathogenic driver of liver fibrosis by activating collagen‐producing HSCs in the injured liver.[5] Although TGF‐β1 is ubiquitously expressed in all liver cells, scRNAseq analysis indicates that macrophages have the highest expression of TGF‐β1 in the liver (data not shown).