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- assertion description "[The following observations were made: (i) recent isolates showed an about 2-fold increase in the number of glycosylation sites of HA and NA when compared to isolates from 1968 to 1970; (ii) during passages of clinical strains in CACO-2 and MDCK cells HA and NA mutated cooperatively with strain-specific variations implying that functioning of the HA-NA complex varied from strain to strain in one influenza outbreak; (iii) there were no amino acid exchanges in the HA receptor binding site although the viruses acquired the ability to agglutinate avian erythrocytes after passage in MDCK cells, suggesting that virus adsorption is regulated by several factors; (iv) quasispecies characterized by deletion of 66 nucleotides (22 amino acids) in the stalk region of the NA gene was dominant in naso-pharyngeal washes of all patients whereas during passaging in CACO-2 cells this deleted genotype in isolates from different patients was either stably retained as prevalent quasispecies or rapidly replaced for that one containing full length NA gene; (v) the M2 protein of clinical viruses was sensitive to amantadine; (vi) the NS segment of human viruses, unlike the most of avian ones, contained an additional positive-sense open reading frame encoding a hypothetical 25kD polypeptide (negative strand protein, NSP).]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine." provenance.
- assertion evidence source_evidence_literature provenance.
- assertion SIO_000772 19546028 provenance.
- assertion wasDerivedFrom BEFREE provenance.
- assertion wasGeneratedBy ECO_0000203 provenance.