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TGF‐β1 protein expression levels after treated botulinum neurotoxin type A (BoNT‐A) using enzyme‐linked immunosorbent assay. The results showed decrease in TGF‐β1 treated with BoNT‐A. In addition, this effect was dose dependent. *P < 0·05 versus control; **P < 0·01 versus control ; ***P < 0·001 versus control.
