San Francisco 49ers DT Earl Mitchell (non-injury) and FS D.J. Reed (chest, heel) did not practice Thursday, Nov. 29. Meanwhile, DE Arik Armstead (back), S Jaquiski Tartt (shoulder), C Weston Richburg (knee), LB Malcolm Smith (Achilles), LB Mark Nzeocha (thigh), OG Josh Garnett (thumb) and CB Greg Mabin (thigh) were each limited.