Article CXCL9 chemokine RNA extraction adult apolipoprotein B apoptosis bariatric surgery blood clotting body mass chemokine complement classical pathway complement component C4 complement component C4b binding protein controlled study down regulation enzymatic degradation extracellular matrix female fibroblast growth factor receptor 2 galectin 3 gap junction gelatinase B gene expression histopathology human lipogenesis lipoprotein A liver biopsy liver cell liver fibrosis