Fig. 3. Expression of ET1335-GUS during development of the first leaf. (A,B) Lateral view, (C-L) abaxial view; (A-J,L) DIC microscopy, (K) dark-field optics. Arrow in F indicates transient expression in GM cells at the tip of 3.5-5.5 DAG primordia. Upper right: primordium age in days after germination (DAG). Lower left: fraction of primordia showing nearly identical features. Scale bars: (A-F) 25 µm; (G) 50 µm; (H,I) 100 µm; (J,K) 500 µm; (L) 1 mm.