18052
This novel kind of protein chimera is characterized by an intramolecular interaction between IL - 2 and binding site of S4B6 mAb similarly as in IL - 2 / S4B6 mAb immunocomplexes .
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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