As the primary immunity-eliciting antigen, hemagglutinin (HA) is the major agent for host-driven antigenic drift in A(H3N2) virus.
Although changes at these two sites had been previously reported to cause antigenic drift in A(H1N1) epidemic strains [77], it was a somewhat common belief that key determinants of receptor-binding specificity are in general not subject to selection.
If Congress does not impose sanctions, the deal could drift in a kind of policy purgatory.
He chronicled Labour's rightwing drift in a book co-authored with Richard Heffernan, Defeat from the Jaws of Victory (1992).
So the most likely outcome is more of the same: continued drift in a state of semi-stagnation.
At the Jewish Museum artifacts drift in a sea of facsimiles, and the two are barely distinguished.
It is reasonable to forecast that a post-Britain EU would be more likely to drift in a protectionist direction.
The newcomers are set apart, at the far end of the vault, by a transparent wall, behind which they drift in a hazy medium.
Concentration is the natural drift in a market system, but it lay dormant or was held in check through most of the last century.
The two of them drift, in a state of elegant melancholy, through various picturesque places, including Paris, London and Fez, where they finally meet, drawn together by a mysterious memory disorder.
The players are told to report back for the afternoon session half an hour before the 5pm start time but some start to drift in a little earlier, including Jonjo Shelvey.
