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Histological appearance of MSC pellet cultures on day 28 after SB431542 treatment under hypertrophic conditions. No difference in DMMB, ALP, collagen type II and collagen type X staining can be detected between hypertrophic control pellets (A, E, I, M) and SB431542 treated pellets (B~D, F~H, J~L, N~P) (Scale bar=200 μm).
