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adMSC-Exos inhibited collagen accumulation and disrupted microvessels in cultured keloid explants. a Immunohistochemical analysis of COL-1, FN, CD31, and CD34 expression in cultured keloid tissue explants (COL-1 and FN, Scale bar = 100 μm. CD34 and CD31, Scale bar = 200 μm). b Semiquantitative analysis of CD31+ and CD34+ microvessel numbers in immunohistochemically stained tissue sections. *P < 0.05 vs PBS group, **P < 0.01 vs PBS group.
