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Morphological changes in bone marrow mesenchymal stem cells after osteogenic and adipogenic induction (inverted phase contrast microscope, × 200).
(A) At day 21 after the osteogenic induction, a large number of calcium nodules formed in the cytoplasm (alizarin red staining, arrows).
(B) At day 14 after the adipogenic induction, salmon-colored lipid droplets of varying sizes were visible in the cytoplasm (oil red O staining, arrows).
