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Hemagglutination titers of H3N2 mutant strains. To distinguish whether the possessing of glycosylation motif site at position 158 failed to bind RBCs, recombinant virus containing HA1-160K, HA1-158K, and LZP were determined by HA assay. A: PBS; B: LZP; C: T160K; D: N158K.
