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Western blot analysis of glutamine synthetase protein (42.5 kDa) content in liver homogenates (20 µg/lane) of growing beef steers grazing endophyte-infected tall fescue and supplemented with 3 mg Se/d in VM mixes as sodium selenite (ISe), SEL-PLEX (OSe), or an 1:1 blend of ISe and OSe (MIX).
