Vascular surgeon Jeffrey Isenberg, now at the University of Pittsburgh Medical Center, and colleagues were studying how the gas nitric oxide promotes blood flow.

血管医师Jeffrey Isenberg现在在匹兹堡大学医学中心工作。他和同事曾研究过一氧化氮如何促进血液流动。

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This is called payment for order flow, and trader-blogger Jeffrey Carter explains the problem.

FORBES: The $50 billion stock market fee