Biology;
Institute,;
School;
of;
Medicine,;
University;
of;
South;
China,;
Hengyang;
421001,;
China;
of;
Histology;
and;
Embryology,;
School;
of;
Medicine,;
University;
of;
South;
China,;
Hengyang;
421001,;
China;
First;
Affiliated;
Hospital;
University;
of;
South;
China,;
Hengyang;
421001,;
China;
of;
Experimental;
Zoology,;
School;
of;
Medicine,;
University;
of;
South;
China,;
Hengyang;
421001,;
China;
Diseases;
and;
STD;
Hospital,;
Shanghai;
200050,;
China;
for;
Disease;
Control;
of;
Hunan;
Province,;
Changsha;
410005,;
China;