Modern;
Biological;
Research;
Center,;
Yunnan;
University,;
Kunming;
650091,;
China;
Henan;
Medical;
School,;
Kaifeng;
475300,;
China;
Tangdu;
Hospital,;
Fourth;
Military;
Medical;
University,;
Xi'an;
710033,;
China;
Deparment;
of;
Cell;
Biology;
and;
Medical;
Genetics,;
Kunming;
Medical;
College,;
Kunming;
650031,;
China;
Kunming;
Institute;
of;
Zoology,;
Chinese;
Academy;
of;
Sciences,;
Kunming;
650223,;
China;
Center;
for;
Theoretical;
Biology,;
Peking;
University,;
Beijing;
100871,;
China;
禽流感; H5N1病毒; 红血球凝聚素分裂位点; RNA; 二级结构; 氨基酸;