Identification of a novel C-terminal domain involved in the negative function of the rainbow trout Ah receptor nuclear translocator protein isoform a (rtARNTa) in Ah receptor-mediated signaling11Abbreviations: ARNT, aryl hydrocarbon receptor nuclear translocator; rtARNT, rainbow trout ARNT; mARNT, mouse ARNT; bHLH, basic helix-loop-helix; PAS, PER-ARNT-SIM; AHR, aryl hydrocarbon receptor; TCDD, 2,3,7,8-tetrachlorodibenzo-p-dioxin; HIF, hypoxia-inducible factor; GAR-HRP, goat anti-rabbit horseradish peroxidase; TBS, Tris-buffered saline; TTBS, Tris-buffered saline with Tween 20; TBE, Tris, boric acid, EDTA; DMEM, Dulbecco’s minimum essential medium; FBS, fetal bovine serum, PCR, polymerase chain reaction; DTT, dithiothreitol; EMSA, electrophoretic mobility shift assay; TNT, transcription and translation; XRE, xenobiotic response element; and P450, cytochrome P450.