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Histology of the three‐dimensional (3D) constructs after 4 weeks of culture with cyclic or permanent exposure to (A) insulin‐like growth factor‐1 (IGF1), IGF2, or sprifermin or (B) bone metamorphic protein 7 (BMP7), C‐type natriuretic peptide (CNP), and sprifermin. Safranin O/Fast green, type I and type II collagen stainings were used. Scale bar: 200 µm. [Color figure can be viewed at wileyonlinelibrary.com]
