Is liver fibrosis just liver fibrosis? Or do the subtype of collagen, its spatial localization in the liver, its cell of origin, and the time point at which it is synthesized also matter? It is important, since the various collagen subtypes hold different informative values regarding reparative processes in the liver, and as collagens have also emerged as important signaling molecules (1). Novel data have challenged our perception of liver fibrosis and collagens, which may have important implications regarding the development of new biomarkers and anti-fibrotic interventions. The traditional histological analysis of liver biopsies using histochemical collagen stains, such as the Masson\u0027s Trichrome stain or the Sirius Red stain, group all triple helical collagen structures into one gross bucket. Importantly, these stains ignore many other quantitatively minor but nonetheless functionally and structurally relevant collagen and non-collagen extracellular matrix (ECM) components

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