Western blots analyses were performed as described previously [25 (link)] using OF-treated Clone 9 cells, while immunoreactive proteins were detected by an enhanced chemiluminescence kit (Bio-Rad). The specific antibodies against STAT3 (signal transducer and activator of transcription 3), phosphorylated STAT3 (pSTAT3), HNF4A (hepatocyte nuclear factor 4, alpha), and GAPDH (glyceraldehyde 3-phosphate dehydrogenase) were purchased from Cell Signaling Technology, Inc. (Danvers, MA, USA).
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