Bottom, signal enters the cell nucleus and causes transcription of DNA, which is then expressed as protein. The MAPK/ERK pathway (also known as the Ras-Raf-MEK-ERK pathway) is a chain of proteins in the cell that communicates a signal from a receptor on the surface of the cell to the DNA in the nucleus of the cell.
Shooting At U.S. Capitol Visitors Center: One Injured, Shooter In Custody. After multiple reports of shots fired at the United States Capitol building today, the Capitol and the White House have been placed on lockdown. The Associated Press is reporting that police report the shooter is down, and one woman, a bystander, appears to have been wounded.
Washington, March 30 -- President Reagan was shot in the chest today by a gunman, apparently acting alone, as Mr. Reagan walked to his limousine after addressing a labor meeting at the Washington Hilton Hotel. The White House press secretary and two law-enforcement officers were also wounded by a burst of shots.