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Appalachian State wide receiver Dexter Jackson did exactly what he had to do today at the NFL Scouting Combine, turning in a blistering 40-yard dash time of 4.27 seconds. Here's a long Jackson highlight video:

Yes, he made some great plays in college, and although that 4.27 is unofficial -- the league hasn't yet released the official, electronically timed 40s -- it appears that Jackson will leave Indianapolis as the fastest player in the 2008 NFL draft.

Jackson is just 5-foot-9 and 178 pounds, and Michigan aside, he doesn't have much experience against top competition. So he's no sure thing as a high draft pick. But the time he turned in today gives him a chance at being chosen on the first day.