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SANTA CLARA, Calif. (AP) - Running back Marcus Lattimore might be the most publicized second-year player for the San Francisco 49ers who sat out as a rookie because of a knee injury. Another player from that class - and an even higher draft pick - rehabbing with Lattimore last season is poised to make an even bigger mark.

Tank Carradine missed all of last year recovering from a torn anterior cruciate ligament in his right knee suffered at the end of the 2012 season with Florida State. There were times, Carradine says, he questioned whether he could ever play at the level that made him the 40th overall draft pick again.

Healthy again, Carradine is getting extra repetitions in practice this week because veteran defensive tackle Justin Smith is out with an undisclosed injury. Coach Jim Harbaugh says Smith is expected back for the start of training camp next month.

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