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The Iranian Transactions Regulations prohibit transactions between U.S. citizens and the government of Iran. Any assets the designees have under U.S. jurisdiction have been frozen.

Treasury said that by identifying these entities — including banks, investment companies and technology firms — “U.S. persons and others are better able to identify Iranian government entities and protect themselves against the risks posed by such entities.”

At the State Department, spokesman P.J.Crowley said, “The cost of doing business for Iran is going up.”