SANTA CLARA, Calif. -- The San Francisco 49ers' practice-participation list looked better Thursday than it did Wednesday.Defensive lineman Justin Smith (shoulder) went through limited drills after not working Wednesday. Backup running back LaMichael James (knee), meanwhile, practiced on limited basis for the first time in the regular season. His status for Sunday's visit from the Indianapolis Colts is uncertain; I'd say it's iffy at best.Defensive tackle Ray McDonald (both ankles sprained) did not practice for the second consecutive day -- though earlier Thursday, defensive coordinator Vic Fangio said he expects his starting group to be fine Sunday.