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Omega - 3 polyunsaturated fatty acids ( PUFAs ) are known to alleviate joint stiffness and pain in rheumatoid arthritis patients .
 Chemical: Omega - 3 polyunsaturated fatty acids; Chemical: PUFAs
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: Omega - 3 polyunsaturated fatty acids; Chemical: PUFAs