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Histochemical staining of B. napus flowers under transient expression. GUS staining can be observed in flowers of the positive control 35S::GUS, FSP046::GUS, and FSP061::GUS, respectively (especially in their sepals, petals, and stamens). While no GUS stained could be detected in negative control (CK-, the empty Agrobacterium). Bar = 1 mm.
