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Undifferentiated MSCs (a–e), osteoblasts (f–j), chondroblasts (k–o), and adipocytes (p–t) were left unstained (a, f, k, & p), or stained with Alizarin Red at day 21 (b, g, l, & q), NBT-BCIP at day 14 (c, h, m, & r), Alcian blue at day 27 (d, i, n, & s), or Oil Red O at day 27 (e, j, o, & t). Scale bar = 50 µm.
