Comparison of plant-produced PG9 and RSH with CHOPG9. Coomassie Brilliant Blue staining of purified PG9 and RSH after separation by SDS/PAGE under (Upper) reducing and (Lower) nonreducing conditions. Heavy chain (HC) bands are indicated by a black arrowhead. A black diamond indicates the light chain (LC) band of CHOPG9, which is N-glycosylated and therefore, has a higher molecular mass than the LC of the plant-produced mAbs (white arrowhead). Arrows indicate fully assembled IgG molecules separated under nonreducing conditions. Lane 1, ΔXFPG9; lane 2, ΔXFPG9Sulf; lane 3, ΔXFPG9SulfSia; lane 4, ΔXFRSH; lane 5, ΔXFRSHSulf; lane 6, ΔXFRSHSulfSia; lane 7, CHOPG9.