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Fig. 4. Expression pattern of the HVE gene as uncovered by the
PETA2-GUS transgene. (A) GUS staining
of Col-0 seedlings carrying (right) or not (left) the
PETA2-GUS transgene. All the remaining pictures
(B-R) correspond to transgenic plants. (B) Roots; (C) a rosette,
magnified in D; (E) cotyledon; (F) first, (G)
third and (H) seventh vegetative leaves; (I) cauline leaf;
(J) sepal; (K) petal and stamen; (L) inflorescence;
(M) several immature flowers; and (N) a single mature flower.
(O-Q) Details of the venation of a first leaf at several magnification
levels; (R) a vein before xylem differentiation (red arrow) in a
seventh leaf. Plant material was collected 10 (A,B), 21 (C-H,O-R) and 35 (I-N)
days after sowing. Scale bars: 1 mm in A-I,N; 2 mm in L; 500 µm in J,K,O;
250 µm in M; 5 µm in P; 2.5 µm in R; 1.25 µm in Q.
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