Leaf Development Takes Shape

The flat shape of most leaves enables them to capture sunlight for photosynthesis more efficiently. But how do leaves develop their flat shape? In their Perspective, [McConnell and Barton][1] discuss new work ([ Nath et al ][2].) that reveals how the differential expression of certain genes within developing leaves of the snapdragon makes these leaves flat. [1]: http://www.sciencemag.org/cgi/content/full/299/5611/1328 [2]: http://www.sciencemag.org/cgi/content/short/299/5611/1404