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Wild type and mutant Epo cDNAs were transiently expressed at high levels in COS1 and COS7 cells .
 Wild type and mutant Epo cDNAs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Wild type and mutant Epo cDNAs