Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12870-016-0918-x/MediaObjects/12870_2016_918_Fig4_HTML.gif)
In situ images of maize leaves following N fertilization reveal vein-level resolution of GlnLux output. Shown are magnified images from Fig. 3. The images highlight transverse veins in leaf 2 (a, b, red boxes). Potential vascular networks of Gln movement through longitudinal and transverse veins are shown in leaf 3 (c, coloured tracings). In each panel, duplicate images of a single leaf are shown, with highlights of vein-level details to the right. Arrows indicate directions of the proximodistal and mediolateral axes