9155
We previously delineated a region in the fatty - acid synthase promoter , which was responsible for obesity - related overexpression of the fatty - acid synthase ( FAS ) gene , by negatively regulating the activity of the downstream promoter in lean but not obese rat fat cells .
 fatty - acid synthase promoter, fatty - acid synthase, FAS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 fatty - acid synthase promoter, fatty - acid synthase, FAS