Protein extraction and Western blotting were performed as described previously (Dichtl et al., 2019 (link)). The antibodies used were a rabbit Fpn1 antibody (1:2000; Eurogentec), a rabbit actin antibody (1:500; Sigma Aldrich), a rabbit Stat3 antibody (1:2000, Cell Signaling), a rabbit phospho-Stat3 antibody (1:2000, Cell Signaling), a rabbit phospho-Smad1/5/9 antibody (1:2000, Cell Signaling) and appropriate HRP-conjugated secondary antibodies (1:2000, anti-rabbit; Dako). For quantification, densitometry data were acquired on a ChemiDoc Touch Imaging System (Bio-Rad Laboratories GmbH) and analyzed with Quantity One software (Bio-Rad Laboratories GmbH).
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