TRPA1 and fibrosis: In the bleomycin-induced fibrosis model, 23.5% (4/17) of TRPM8 positive neurons expressed TLR2, 18.2% (4/22) of TRPV1 neurons expressed TLR2, and 44.4% (4/9) of TRPA1 neurons expressed TLR2 in the DRG (S1 File).