Enhancing the expression levels of Fabs (antigen-binding antibody fragments) in Escherichia coli is a difficult field that has a variety of potential exciting implications. The field has grown substantially in the past twenty years. The main area of difficulty is facilitating the entry of the antibody fragments into the periplasm of E. Coli, where the antibody fragments can be successfully expressed. Entry into the periplasm is difficult for antibody fragments due to their inability to fold in any other section besides the periplasm.
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