San Francisco 49ers sign Pro Bowl center Alex Mack to 3-year deal - ESPN
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Veteran center Mack retires from NFL - AS USA
San Francisco 49ers agree six-year, $138.06m deal with Trent Williams, NFL News
49ers sign six-time Pro Bowler Alex Mack
49ers' Alex Mack, 35, excited to show he still has it: 'I think I can be great in this system'
Former Falcons center Alex Mack announces retirement
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49ers restructure Alex Mack's contract, create $4 million in cap space
49ers eager to see what center Alex Mack has left at 35
49ers eager to see what center Alex Mack has left at 35