Oklahoma football notebook: Lane Johnson, Bronson Irwin provide latest O-line scares - Article Photos 44/47

Oklahoma's Brennan Clay (24) carries the ball in the fourth quarter during a college football game between the University of Oklahoma (OU) and Iowa State University (ISU) at Jack Trice Stadium in Ames, Iowa, Saturday, Nov. 3, 2012. OU won, 35-20. Photo by Nate Billings, The Oklahoman