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We have obtained the human EP4 receptor gene sequence and determined its structure relative to EP4R cDNA synthesized from peripheral blood lymphocytes .
 human EP4 receptor gene sequence, EP4R cDNA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 human EP4 receptor gene sequence, EP4R cDNA