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???Ʊ? ȿ???ֳ????
???Ʊ??? ?߱??????? ?????ظ?ü?? ?????Ͽ? cGMP?? ???ؽ?Ű?? ??5?? ?????????̿???????(phosphodiesterase) ???? ȿ?Ҹ? ?????????μ? ?????ظ?ü???? ?????Ǵ? ??ȭ???? (NO)?? ?ۿ??? ??ȭ?Ͽ? ???Ƶ??? Ȯ???? ???ӽ?Ŵ???μ? ?߱??????? ġ??ȿ???? ???Դϴ?.