FACS analysis was performed as described previously [17 (link)]. We used the following fluorescein isothiocyanate (FITC)-conjugated antibodies and primary antibodies: FITC-conjugated isotype control (Becton Dickinson), FITC-conjugated anti-α2-integrin (BioLegend), and anti-β1-integrin (Abcam). Mean fluorescence intensity (MFI) was calculated by subtracting the intensities of the controls.
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