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Fatty acids are endogenous ligands of peroxisome proliferator - activated receptor - alpha ( PPAR alpha ) , which is linked to the regulation of fatty acid uptake , lipid metabolism and breast cancer cell growth .
 Chemical: Fatty acids; Chemical: fatty acid
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 acid