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X-gluc staining of GUS–FFT–promoter-transformed plants (each row, left–right). (a) Seedling roots: day 4 post-stratification; day 7 root tip, elongation zone, and developing lateral root; day 12; day 17. (b) Aerial tissues: (row 1) cotyledon guard cells (GC); mature leaf hydathode GC; nectaries; (row 2) inflorescence apex; silique apex; close-up of papillae and stigma GC; (row 3) anther GC; developing seed in siliques; developing silique.
