20Q: Who Takes Over For Travis Frederick?
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Travis Frederick, Cowboys Pro Bowl center, has autoimmune disease
Travis Frederick among Top 20 Cowboys offensive linemen of all-time
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Cowboys star Travis Frederick retires at 29: 'I faced a struggle'
On This the N.F.L. Agrees: The Cowboys' Offensive Line Is No. 1 - The New York Times
Cowboys' Travis Frederick wins Halas Award for overcoming adversity - ESPN
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Cowboys center Travis Frederick announces retirement from NFL