Questions pertaining to sodium dodecyl sulfate polyacrylamide gel electrophoresis, a technique used to separate proteins according to electrophoretic mobility

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Relative densitometry from SDS PAGE

I'd like to perform densitometry on a Coomassie stained SDS PAGE gel to compare a recombinant protein's expression levels under two conditions. I'm using BioRad's Image Lab software. My questions are ...
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SDS-Page-Concentration confusion

So I purified some a protein, purified it using two different types of resins (comparing resins for cost efficiency). Ran a Bradford Assay to find concentrations of each. Unsure of SDS-Page protocol ...