TrpA1 sequence has been inserted into the attP site present in TI{TI}TrpA1KO, reconstituting a wild-type TrpA1 transcription unit in which a Tag:FLAG tag has been inserted immediately before the endogenous stop codon in exon 18. A single attR site is present upstream of the introduced TrpA1 sequence, and a single loxP site is present downstream of the introduced TrpA1 sequence.