There is a mixed protein solution, and the PI of various proteins is 4.6; 5.0; 5.3; 6.7; 7.3. In electrophoresis, if 4 kinds of swimming are to be made to the positive electrode, the pH of the buffer should be( )
A.
5.0
B.
6.0
C.
7.0
D.
8.0
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