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Simplify this scientific paper for undergraduate students.

Relevant data:
'We utilized the Bradford assay to determine protein concentration from extracts of our samples, which were then loaded into a sodium dodecyl sulfate polyacrylamide gel electrophoresis chamber for separation according to their molecular weight to detect differences in protein composition and size.'
gpt
We used a test to find out how much protein was in our samples. Then we separated the proteins by their size and looked for any differences.