28012
We disclose herein the use of this assay to identify a cell - permeable compound capable of blocking the transfer of SUMO - 1 from the E2 enzyme Ubc9 to the substrate .
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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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