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Histomorphological staining of hUMSC pellets. (A) The extent of chondrogenesis was evaluated by H&E, Alcian blue, safranin O and Col II immunofluorescence after 14 and 21 days of coculture. (B) Semiquantitative analysis of H&E, Alcian blue, safranin O and Col II immunofluorescence. Data are presented as the mean ± SD (n = 3). Statistical analysis: *P < 0.05, **P < 0.01, ***P < 0.001.
