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The complete sequence of the neuraminidase gene of influenza virus A/NT/60/68 (N2 subtype) was determined following cloning of full length complementary DNA into pBR322. Comparison of the predicted amino acid sequence with a closely related neuraminidase from A/Udorn/72 suggests that point mutations over an extensive region of the primary sequence can contribute to antigenic drift, although the region between amino acid residues 308 and 371 may be particularly significant.

Sequence of the N2 neuraminidase from influenza virus A/NT/60/68