ov ir idae : ▁the ▁vir uses ▁and ▁their ▁rep lication . ▁Field s ▁V iro log y ▁( 2 0 0 1 ) ▁Str ucture ▁of ▁the ▁uncle aved ▁e ct od om ain ▁of ▁the ▁param y x ov irus ▁( h PI V 3 ) ▁fusion ▁protein . ▁Pro ceed ings ▁of ▁the ▁National ▁Academy ▁of ▁Sciences ▁( 2 0 0 5 ) ▁Str ucture ▁of ▁the ▁par ain fl uen za ▁virus ▁ 5 ▁F ▁protein ▁in ▁its ▁met ast able , ▁pre - f usion ▁con formation . ▁Nature ▁( 2 0 0 6 ) ▁The ▁M 2 ▁pro ton ▁channels ▁of ▁influen za ▁A ▁and ▁B ▁vir uses . ▁Journal ▁of ▁Bi ological ▁Chem istry ▁( 2 0 0 6 ) ▁A ▁new ▁influen za ▁virus ▁vir ul ence ▁determin ant : ▁the ▁NS 1 ▁protein ▁four ▁C - term inal ▁resid ues ▁mod ulate ▁path ogen icity . ▁Pro ceed ings ▁of ▁the ▁National ▁Academy ▁of ▁Sciences ▁( 2 0 0 8 ) ▁In fl uen za ▁virus ▁M 2 ▁protein ▁medi ates ▁E SC RT - in dependent ▁memb rane ▁sc ission . ▁Cell ▁( 2 0 1 0 ) ▁In fl uen za ▁virus ▁assembly ▁and ▁bud ding . ▁V iro log y ▁( 2 0 1 1 ) ▁Str ucture ▁of ▁the ▁New castle ▁disease ▁virus ▁hem ag gl ut in in - neur amin id ase ▁( H N ) ▁e ct od om ain ▁reve als ▁a ▁four - hel ix