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A. PME increased the thickness of dermal layer (×200). Elastic fiber was shown by red color in three pictures which proved that PME groups had larger distrubution than the other two groups, but TSG group had more orderly elastic fibers and flatter edge than the control group and PME group. B. The result of image scan showed that the content of elastic fiber in PME group was higher than control group (p<0.05, vs. Control group).
