ARNT

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ARNT (Ah Receptor Nuclear Translocator), a protein in cell nucleus which acts as a partner of AH receptor (see this) and some other transcription factors. The complex of AHR + ARNT is called heterodimer, because it is a dimer of two different proteins. ARNT is in fact a misnomer, since it was previously thought to translocate AHR from the cytoplasm of the cell to the nucleus, but in fact it only binds AHR after this has entered the nucleus.