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Synthetic citrullinated peptides , in contrast , are easily obtained in a pure form with a well - defined chemical structure and the epitopes can be precisely oriented in the plate by covalent binding of the peptides . Chimeric peptides bearing different citrullinated protein domains have recently been used in the design of RA diagnosis systems .
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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:
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