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
****
Q: Previous studies have shown that the IME1 gene is required for sporulation and the expression of meiosis specific genes in Saccharomyces cerevisiae .

A: IME1 gene
****
Q: We recently described the isolation and characterization of nontoxic PAP mutants , NT123 - 2 , which has a point mutation ( E176V ) in the active site that abolishes enzymatic activity , and NT124 - 3 , which has a nonsense mutation that results in deletion of the C - terminal 25 aa ( W237Stop ) .

A:
PAP mutants
****