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By Pull-down assay, you can get the proeins that interact with the bait protein. The next step you should do is to identify the prey proteins, for example, by MS. Today, protein identification (or sequencing) is much more difficult than nucleic acid identification (sequencing). So, it is likely for you to get a lot of unknown proteins and for these protieins, you can only know some small part of their peptide fragments. Maybe it is the largest disadvantage of pull-down assay.
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