Article Photos: Second-half performance can be building block for Cowboy defense 47/57

Oklahoma State's Dez Bryant (1) is tripped up by Texas Tech's Chris Parker (17) during the second half of the college football game between the Oklahoma State University Cowboys (OSU) and the Texas Tech University Red Raiders (TTU) at Boone Pickens Stadium in Stilllwater, Okla., on Saturday, Sept. 22, 2007. OSU won, 49-45. By NATE BILLINGS, The Oklahoman