??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??
“????”??????????? ??DNA???????
“????”??????????? ??DNA???????
??
????:
1?????????????:???????
2????????
3???498??????
4???????????
5??????
????
6
%
???:??