2297
This model suggests that forced expression of CDK4 sensitizes cells and synergizes with a second change resulting in tumor development .
 Anatomy: cells; Anatomy: tumor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: cells; Anatomy: tumor