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(a) Alizarin red staining (ARS) and (b) OsteoImage staining of cryosections (10–20 µm) of mineralized microtissues with and without siRNA or/and BMP-2 after 21 days in osteogenic medium (ctr: non-treated control, nc: non-coding siRNA, chrd: chordin siRNA). Scale bar represents 50 µm.
