The cDNA of one major clinically relevant allergen of Timothy grass/Phleum pratense (Phl p 5) was fused to a transmembrane domain and a leader peptide (described in Baranyi et al., J Immunol 2008, 180: 8168-8175) and cloned into pcall2 IRES eGFP vector, under control of a chicken beta globulin promoter and CMV enhancer. (J:310820)