15783
All hepatocarcinogens , irrespective of their cytomegaly inducing potential , increased liver cells immunoreactive for p21 ( Cip1 ) , which acts on cells arrested in G ( 1 ) phase , and for Aurora B or Incenp , which is suggestive of an increase in a cell population with chromosomal instability caused by overexpression .
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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