18053
Our protein chimera has biological activity comparable to IL - 2 / S4B6 mAb immunocomplexes in vitro , as shown by stimulation of proliferation of purified and activated OT - I CD8 ( + ) T cells .
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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:
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