Purification of 6D8 mAb from N. benthamiana leaves. 6D8 mAb from the multi-replicon single vector (pBY-HL(6D8).R) Infiltrated leaves was purified and analyzed on a SDS-PAGE under reducing conditions. Lane 1, Clarified plant extract ; lane 2, Plant proteins removed by 35% ammonium sulfate precipitation; lane 3, 60% ammonium sulfate pellet fraction resuspended for Protein G Chromatography; lane 4, Protein G flow-through fraction; lane 5, Purified 6D8 mAb in the Protein G eluate; lane 6, Human IgG as a reference standard.