Véronique LaCapra

Researchers at Washington University have genetically-engineered cells to react to light.

By taking light-sensing receptors from the eye — called opsins — and inserting them into immune cells, the researchers were able to trick the cells into moving toward a laser beam, in the same way they would move toward a bacterial infection.

Washington University molecular biologist N. Gautam led the research.

Tyson Foods has agreed to pay close to $4 million in civil penalties to settle alleged violations of the federal Clean Air Act in four Midwestern states including Missouri.

According to a consent decree filed on Friday in U.S. District Court in St. Louis, the penalties are in response to eight accidental releases of anhydrous ammonia at Tyson facilities between 2006 and 2010.

Saint Louis University is launching a study to explore whether two cancer medications could also help protect U.S. troops from bioterrorism attacks.

SLU is part of a consortium of institutions participating in the project, which is funded by the U.S. Department of Defense.

Updated at 4:30 p.m.

Missouri's Attorney General Chris Koster has filed a lawsuit in response to the ongoing concerns surrounding the Bridgeton Landfill.