Cells were homogenized in RIPA buffer as previously described (30 (link)). Antibodies for analyses included: RON (1:200, sc-322, Santa Cruz Biotechnology), Arginase-1 (1:1000, 610708, BD Transduction Labs), p-STAT3 (Y705) (1:800, 9145S, Cell Signaling Technology), STAT3 (1:500, 9139S, Cell Signaling Technology), and C4-actin (ACTIN) (1:40,000, Cincinnati Children’s Hospital Medical Center; 1:5000, sc-47778, Santa Cruz Biotechnology).