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what is single chain variable fragment and what makes it help detect a protein like Her...

what is single chain variable fragment and what makes it help detect a protein like Her 2?

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Single chain variable fragment: It is a fusion protein consisting of variable regions of heavy and light chains of immunoglobulins joined together by a peptide linker( short peptide linker of 10-25 amino acids ).

They are used in detecting proteins like Her2 because:

  • of their small size which facilitate the crystallographic study of cells interactions.
  • they are highly immunogenic and have distinct antigens that extract antibodies specific for breast cancer.
  • it can be designed as a bispecific antibody to work as immunotoxin.
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