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.
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Question: Synthesis and structure-activity relationships of indazole arylsulfonamides as allosteric CC-chemokine receptor 4 (CCR4) antagonists.

Answer: CC-chemokine receptor 4

Question: The effect of vitamin B6 deficiency on alanine: glyoxylate aminotransferase isoenzymes in rat liver.

Answer: alanine: glyoxylate aminotransferase

Question: Studies on an (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptor antagonist IKM-159: asymmetric synthesis, neuroactivity, and structural characterization.

Answer:
(AMPA) receptor