K2-tartarate gradient centrifugation in the isolation of purified influenza virus haemagglutinin after bromelain cleavage.

1983 
: A method of haemagglutinin (HA) purification by means of K2-tartarate gradient centrifugation is described. Different influenza virus strains possessing the antigenic formulas H1N1, H2N2 and H3N2 yielded pure and immunologically active HA samples.
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