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Immunohistological staining: left column for collagen type I, right column for collagen type II (1a)/(1b) alginate gel: w/o GF, cartilage formation: IGF-I; (2a)/(2b) alginate gel: w/o GF, cartilage formation: w/o GF; (5a)/(5b) alginate gel: IGF-I&TGF-β1, cartilage formation: IGF-I; (6a)/(6b) alginate gel: IGF-I&TGF-β1, cartilage formation: w/o GF; condition 3 and 4 not shown (scale bar= 100 µm)
