AUTHOR=Gaupels Frank , Ghirardo Andrea TITLE=The extrafascicular phloem is made for fighting JOURNAL=Frontiers in Plant Science VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2013.00187 DOI=10.3389/fpls.2013.00187 ISSN=1664-462X