In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Q: The aromatic hydrocarbon receptor ( AHR ) is a ligand - activated transcription factor that regulates the expression of several drug - metabolizing enzymes and has been implicated in immunosuppression , teratogenesis , cell - specific hyperplasia , and certain types of malignancies and toxicities .
A:
aromatic hydrocarbon receptor