Proteins were extracted using urea buffer and analyzed by Western blotting as previously described in Pickard et al. (19 (link)). Primary antibodies used were mouse mAb to BiP (1:1000; sc-376768; Santa Cruz Biotechnology, Dallas, TX, USA), rabbit pAb to collagen-I (1:500; OARA02579; Gentaur, Kampenhout, Belgium), mouse mAb to glyceraldehyde-3-phosphate dehydrogenase (GAPDH; 1:10,000; clone GAPDH-71.1; MilliporeSigma), mouse mAb to vinculin (1:800; V9131; MilliporeSigma), and mouse mAb to β-actin (1:2000; sc-8432; Santa Cruz Biotechnology).
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