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Primary isolated mBMMSCs cultured in 0 nM, 1 nM, 10 nM, 100 nM VD3 medium for 14 days to do colony forming unit (CFU) assay. (A-D) show the mBMMSCs cultured in 0 nM, 1 nM, 10 nM, 100 nM VD3 medium after 14 days by microscope. Magnification ×100. And (a-d) is magnification ×200.
