23458
Moreover , multiple alternations in cell cycle regulators activity were found ( i . e . cyclinD1 , cyclin - dependent kinase 4 and 6 , p21 , p27 , p53 , pRb ) leading to cell cycle cessation in G0 phase .
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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