20718
In the budding yeast Saccharomyces cerevisiae , Whi3 , a negative regulator of the G1 cyclins , has been identified as a positive regulator of cell size control and is involved in the regulation of Start .
 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