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Micographs (10× magnification) of osteogenic differentiation of stem cells derived from apical papilla (SCAP) stained by alizarin red 14 & 21 days after exposure to: culture medium without osteogenic reagents (DMEM-OS), culture medium supplemented with osteogenic reagents (DMEM+OS), MTA extract in osteogenic medium (MTA+OS), and CEM extract in osteogenic medium (CEM+OS) (DMEM+OS)
