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The allergenicity determined by ELISA, western blot, and BAT suggested 76.9% (30/39) of the P. acerifolia pollen allergic patients displayed specific IgE recognition of the profilin. The profilin shared80% sequence identity with Pop n 2, the profilin from Populus nigra, and observed a significant cross-reactivity with Pop n 2 in IgE-inhibition assay. Profilin, as one of the major component allergens in P. acerifolia pollen, was identified and characterized at molecular and immunochemical levels in this study. These findings would co