Gel Electrophoresis
In isoelectric focusing, proteins are separated on the basis of their

relative content of negatively charged residue only
relative content of positively and negatively charged residue
relative content of positively charged residue only
size

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Gel Electrophoresis
In an SDS-PAGE

proteins are denatured by the SDS
All of these
smaller proteins migrate more rapidly through the gel
proteins have the same charge-to-mass ratio

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