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Estradiol ( E2 ) and progesterone ( P4 ) plasma levels were measured by radioimmunoassay .
 Chemical: Estradiol; Chemical: progesterone
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: Estradiol; Chemical: progesterone