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Oxalate oxidase (OxO) leaf disk assays. a Ellis 1 non-transgenic control, b AZ-4SX38, c AZ-4SX28, d AZ-4SX1, e AZ-4SX311, f AZ-4SX18. Left leaf disks no OA, right leaf disks added OA. Dark staining indicates a positive OxO reaction. Bars = 5 mm
