7224
Expression of thymidine kinase gene in normal human diploid cells is both cell cycle - and age - dependent and appears to be transcriptionally regulated .
 GENE: thymidine kinase gene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: thymidine kinase gene 
Answer:
 GENE: thymidine kinase gene