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Let's say I purified a GST X protein on a glutathione column and i eluted my...

Let's say I purified a GST X protein on a glutathione column and i eluted my column in 10 fractions. I run samples from the fractions on a gel and stain with coomassie blue in order to find the fraction that contains my protein. I determined that to be fraction 3 but to my surprise I found 2 bands in fraction 3 with 2 different molecular weights. Explain

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