State;
Key;
Laboratoo';
of;
Medieal;
Molecular;
Biology,;
Department;
of;
Biochemistry;
and;
Molecular;
Biology,;
Institute;
of;
Basic;
Medical;
Sciences,;
Chinese;
Academy;
of;
Medical;
Sciences;
&;
Peking;
Union;
Medical;
College,;
Beijing;
100005,;
China;