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Secretion of transforming growth factor (TGF)-β1 precursor. A: TGF-β1 precursor identified by Western blotting in THP-1 macrophages, without differentiation, or following differentiation to M1, M2a, or M2c macrophages. B: TGF-β1 precursor measurement in the medium by ELISA of macrophages alone or following 24 h of coculture with adipocytes. *P < 0.05 vs. macrophages alone.
