Coomassie Blue-stained SDS-PAGE gel of purified maize and mosaic AGPase subunits. Lane 1, Molecular mass markers (207 kD, 129 kD, 85 kD, 39 kD); lane 2, maize AGPase; lane 3, P; lane 4, MP; lane 5, P2M2P. Approximately 2 μg of purified sample was loaded in each lane. All AGPases are expressed with the wild-type maize large subunit (SH2).