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This study was designed to screen candidate fatty acids from breast cancer tissue and to investigate the effects of these candidate fatty acids on PPAR alpha expression , cell growth and cell cycle progression in breast cancer cell lines .
 Chemical: fatty acids; Chemical: fatty acids
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fatty acids; Chemical: fatty acids