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Immunofluorescence staining of hMSC spheroids with endothelial cell markers CD31 (A, C, and E) and VE-Cadherin (B, D, and F) under different culture conditions. (A, B) hMSC spheroids cultured in cell medium. (C, D) hMSC spheroids cultured on cECM hydrogels. (E, F) hMSC spheroids cultured on Fn-cECM hydrogels. Scale bar: 100 μm.
