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Detroit Lions center Frank Ragnow, 29, has announced his retirement from the NFL after a six-year career with the team. Ragnow, a three-time All-Pro and four-time Pro Bowler, cited health concerns as the reason for his decision. He started all 96 games he played for the Lions, a first-round pick in 2018. Second-round pick Tate Ratledge is expected to fill his position.