5659
Mutagenesis of the most proximal Pit - 1 site decreased promoter activity in chicken e11 pituitary cells , indicating regulation of ras - dva by Pit - 1 .
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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