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Fibroblasts migration in keloid dermis at different depths. (A) Tissue strip containing full-thickness keloid dermis was cut out. (B) Tissue strip was fixed by glass and cultured in medium. (C) Fibroblast migrating was observed after 7 days and (D) The migration distance was measured. SD, superficial dermis; MD, middle dermis; DD, deep dermis. ***Behavior, p < 0.001.
