12590
Cell cycle analysis on K562 cells showed that compounds 1 , 2 and 23 caused accumulation of cells in the G2 / M phase , but inhibition of microtubule polymerization is not the principal mode of action of the compounds .
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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