Protein expression of ALP, OPN, OC, and COL1a1 was evaluated by flow cytometry analysis, following a previous protocol [35 (link)]. Samples were processed using a FACS Canto II flow cytometer (BD Biosciences, San Jose, CA, USA), and data were analyzed using FACSDiva v6.1.3, IDEAS software (BD Biosciences, San Jose, CA, USA), and FlowJo v8.3.3 software (Tree Star Inc., Ashland, OR, USA). Data are indicated as a mean fluorescence intensity (MFI) ratio calculated by dividing the MFI of positive events by the MFI of negative events (MFI of secondary antibody).
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