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Steven Jackson active for Rams

The St. Louis Rams kept running back Steven Jackson active against the Seattle Seahawks on Sunday.

Jackson jogged lightly during warm-ups and did not simulate game situations. The Seahawks should find out early whether Jackson can play at his usual high level.

Jackson played through a back injury last season. The strained groin he suffered against the Washington Redskins in Week 3 presents different challenges, as Jackson discussed Friday.

"This is a little different," Jackson said. "Last year's injury was more dealing with the nerve and there's no really pain medicine for that. It's just your threshold of pain, where a groin injury is somewhat like a hamstring, soft tissue. It's really hard. It's really hard to deal with because certain things are just so limited because of the injury."

Jackson saw limited work Friday in practice. Jackson, who is nursing a groin injury, did not practice Wednesday or Thursday.

Jackson has rushed for 214 yards on 51 carries for the Rams (1-2). He also has scored one touchdown.

Backup Kenneth Darby will likely get the bulk of the carries when Jackson isn't in the game. Darby has been an infrequent contributor since signing with the Rams in 2008, but scored the go-ahead touchdown against the Redskins in Week 3 on a 12-yard run.

Darby had a career-high 14 carries and averaged 3.5 yards per attempt in gaining 49 yards in relief of Jackson last week.

Information from ESPN.com's Mike Sando and The Associated Press was used in this report.