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Comparison of 3-D models of the potential N-glycosylation site in the HA molecules of egg- and MDCK-grown Brisbane/60 viruses. The Brisbane/60 E4/E4 (egg-grown) virus had one amino acid substitution at residue 197 in the HA protein by egg adaptation, resulting in the loss of an N-glycosylation site that exists in the original MDCK-grown wild-type virus.
