Western blot analysis of proteins was conducted as previously described 43 (link), 52 (link). The primary antibodies used were CD206 (1:1000; R&D system), Arginase-1 (Arg-1, 1:500; Santa Cruz), CD63 (1:800; Santa Cruz), TSG101 (1:800; Abcam), Calnexin (1:800; Servicebio), PDGFR-α (1:1000; Santa Cruz), MBP (1:1000; Abcam), β-actin (1:1000; Proteintech, CA), GAPDH (1:1000; Santa Cruz). The semi-quantification of the chemiluminescence signal was calculated using Image J software and all gene band gray value was standardized to the expression of β-actin or GAPDH.
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