Expressed in pollen (at protein level) (PubMed:19173789, PubMed:27255304). Expressed in pollen (Ref.1, PubMed:27255304). Expression of mRNA is induced by ground vehicle traffic-related air pollution. No significant difference in the level of protein expression between pollen samples collected from urban polluted versus unpolluted areas. Causes an allergic reaction in human (Ref.1, PubMed:19173789, PubMed:19217563). Binds to IgE in 57% of the 7 patients tested allergic to oriental plane-tree pollen (Ref.1, PubMed:19217563). Binds to IgE in 21% of the 19 patients tested allergic to oriental plane-tree pollen (PubMed:19173789). Belongs to the PMEI family.