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In OP - treated bank vole Leydig cells , inhomogeneous staining of estrogen receptor alpha ( ER alpha ) within cell nuclei was found , whereas it was of various intensity among MA - 10 Leydig cells .
 Chemical: estrogen
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: estrogen