18051
This protein chimera mimics the structure of IL - 2 / S4B6 mAb immunocomplexes but eliminates general disadvantages of immunocomplexes like possible excess of either IL - 2 or anti - IL - 2 mAb and their dissociation to antibody and IL - 2 at low concentrations .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None