Article Photos: Oklahoma football notebook: Lane Johnson, Bronson Irwin provide latest O-line scares 30/47

Oklahoma's Aaron Colvin (14) and Tony Jefferson (1) break up a pass intended for Iowa State's Josh Lenz (19) 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. Oklahoma won 35-20. Photo by Bryan Terry, The Oklahoman