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Sequential observations of exencephaly and subsequent morphological changes by mouse exo utero development system : analysis of the mechanism of transformation from exencephaly to anencephaly .
 exencephaly, exencephaly, anencephaly
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 exencephaly, exencephaly, anencephaly