Figure 2.

Schematic representation of tree pollen allergens clustered according to protein functions; major allergens are depicted in bold, minor allergens in regular font. Allergens of the Lamiales order are presented in purple, Proteales in red, Fagales in blue, Pinales in green, and other in black. Allergen structures were obtained from the RCSB PDB protein data bank (http://www.rcsb.org) and photographs from Fotolia.