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 .
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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