A transcriptional construct with the internal
trxr-2 promoter was mostly expressed in intestine, while the one with the external
trxr-2 promoter, identical to the
unc-32 promoter, was expressed in head neurons, nerve cord, and vulva as previously shown (Barstead, 1999a; Pujol et al., 2001). TRXR-2::gfp was prominent in intestine when driven by internal
trxr-2 promoter, and in muscles by external promoter.