Article Photos: Oklahoma football notebook: Lane Johnson, Bronson Irwin provide latest O-line scares 26/47

Oklahoma's Kenny Stills (4) leaves behind Iowa State's Jansen Watson (2) after a catch in the first 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. Photo by Nate Billings, The Oklahoman