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DT Marvin Austin signs with Dolphins; DL Vaughn Martin placed on reserve-injured list

Defensive tackle Marvin Austin has signed with the Miami Dolphins, who placed backup defensive lineman Vaughn Martin on the reserve-injured list.

The 312-pound Austin was a second-round pick by the New York Giants in 2011, but he battled injuries and played in just eight games with them, all in 2012. The Giants released Austin last month.

Martin, a fifth-year pro, played as a reserve in the Dolphins' first three games. They didn't disclose the nature of his injury Tuesday.

Defensive tackle Paul Soliai, Miami's best run-stopper, has been sidelined by a knee injury.

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