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Doolittle (elbow) has begun throwing bullpen sessions, Bobby Blanco of MASNSports.com reports.

The hope is that Doolittle can advance to live batting practice sessions sometime next week and begin a minor-league rehab assignment soon after. He's on track to join the Nationals' bullpen around late April or early May, and is coming off surgery last July to repair a partial tear of the UCL in his left elbow.

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