Neuraminidase subtype N2 (amino acids 30 - 461) from Influenza A virus subtype H9N2 (A/Bat/Egypt/381OP/2017). The protein is equipped with a c-terminal FLAG-tag and was expressed in Expi293 cells. Purification was performed using FLAG-M2 affinity chromatography followed by dialysis against 1X PBS pH 7.4.