Heterogeneity of neuraminidase genetic information in an H1N2 reassortant influenza virus [X-7 (F1)]

Abstract
CDNA clones of the neuraminidase gene from the reassortant influenza virus X-7 (F1) have different sequences. Some clones are more closely related to A/Tokyo/67 neuraminidase than to the A/RI/5+/57 NA gene from which the NA of X-7 (F1) was derived.