A) The JAK inhibitor baricitinib (Ba) blocked LIF-induced STAT3 phosphorylation. BCE cells were pre-incubated with DMSO, baricitinib (2 μM), cobimetinib (Co) (150 nM) or BEZ235 (BE) (5 nM) for 1 hour and were then treated with vehicle or LIF (10 ng/ml, Sigma) for 15 minutes. Ctrl, no pre-incubation with inhibitors. 