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Proliferation and morphology of human MSCs on the SF/GO films. (A) RFU can reflect the number of cells on SF/GO films. The population doubling time was about 5 d. (B) Morphology of human MSCs on TCP, GO coating, SF film, SG2 film, and SG10 film with actin stained in green by Alexa Fluor 488 phalloidin and nuclei stained by DAPI after the cells were cultured for 1 and 5 d.
