Clinton underwent a procedure called angioplasty, the hospital said, in which a balloon catheter is threaded through an artery to the blocked vessel in the heart.

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In addition, the modular design could make it more difficult to inspect and maintain key components, many of which would be located within the pressure vessel at the heart of the reactor, he said.

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This is like arguing that plaque inside the arteries of heart patients is protective because it holds the vessel wall together, Schenk says.

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