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This study analyzes the effects of pituitary extract supplement on the cultivation of bovine knee chondrocytes (BKCs) in three‐dimensional chitin/chitosan biomaterials. Transforming growth factor‐β1 (TGF‐β1) in the supplement was identified by Western blot near 23 kDa, and the immunoassayed concentration of TGF‐β1 in the supplement was about 33 ng/mL. The typical pore diameter of the chitin/chitosan...