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Immunohistochemical , electron microscopic and morphometric studies of estrogen - induced rat prolactinomas after bromocriptine treatment .
 estrogen, prolactinomas, bromocriptine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 estrogen, prolactinomas, bromocriptine