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Phylogenetic tree of plant orders generated using the software phyloT a phylogenetic tree generator, based on NCBI taxonomy (http://phylot.biobyte.de/). Taxonomic orders containing species which have been acknowledged by the WHO/IUIS allergen nomenclature database (www.allergen.org) are highlighted in color (Pinales in green; Proteales in red; Lamiales in purple; Fagales in blue; and other in yellow). Photographs were obtained from Fotolia.
