Article Photos: Oklahoma football notebook: Lane Johnson, Bronson Irwin provide latest O-line scares 1/47

Oklahoma's Sterling Shepard (3) reacts near Lacoltan Bester (81) and Justin Brown (19) after scoring a touchdown in the second 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