The extraction and detection methods for hegf employ in this study were identical to that reported previously [38 (link), 39 (link)]. His-tagged hegf protein was extracted from culture supernatant using a protein purification kit (Sangon Biotech, Shanghai). The protein electrophoresis procedure was identical to the previous publication [40 (link)]. SAM was extracted and measured using our previously established method [41 (link), 42 (link)].
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