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    Modification of ricin A chain, by addition of endoplasmic reticulum (KDEL) or Golgi (YQRL) retention sequences, enhances its cytotoxicity and translocation

     A pKK expression system in Escherichia coli was used to produce recombinant ricin A chain (rRTA) and rRTA modified by addition of organelle-specific amino acid retention sequences, including KDEL (an endoplas...

    **biao Zhan, Patrick Stayton, Oliver W. Press in Cancer Immunology, Immunotherapy (1998)