23307
Furthermore , the viability of cells that are unable to undergo rapid Cdk1 activation , and the strong association between endoreduplication and impaired proliferation , may place restrictions on the therapeutic use of a Cdk1 inhibitors .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None