Where can mixed martial arts competitors fight under the Unified Rules?

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Under the Unified Rules of Mixed Martial Arts, competitors fight within a ring or a fenced area.12

These standardized regulations were adopted by regulatory bodies across the United States and by many fighting promotions worldwide to govern the sport globally. In the United States, these matches are overseen by state athletic commissions, which are responsible for assigning referees and judges, as well as conducting necessary medical and drug testing for the athletes.123