TABLE 1.

PCR primer sequence.

Primer	Sequence
TRPA1	Forward primer: 5′-GCG​GTT​GGG​GAC​ATT​GCT​GAG-3′
	Reverse primer: 5′-TGG​ATA​CAC​GAT​GGT​GGA​CCT​CTG-3′
SP	Forward primer: 5′-TTG​GTC​CGA​CTG​GTC​CGA​CAG-3′
	Reverse primer: 5′-GAACTGCTGADDCTTGGGTCTTC-3′
CGRP	Forward primer: 5′-AGT​GAA​GAA​GAA​GTT​CGC​CTG​CTG-3′
	Reverse primer: 5′-CCT​CCT​GCT​CTT​CCT​CCT​GCT​C-3′
β-actin	Forward primer: 5′-GAC​GGC​CAG​GTC​ATC​ACT​ATT​G-3′
	Reverse primer: 5′-AGG​AAG​GCT​GGA​AAA​GAG​CC-3′