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Gelatin hydrogel (GH) containing anti-transforming growth factor β (TGF-β) antibody. GH soaked overnight in phosphate-buffered saline (PBS) (A) did not show a positive staining image by immunostaining, however, we were able to verify a wide range of positive staining images (red) at sections of sliced GH with anti-TGF-β antibody (B) overnight. Scale bars: 500 μm.
