553
It was found that the transformation of exencephalic tissue was not simply size - dependent , and all cases of anencephaly at E18 . 5 resulted from embryos with a large amount of exencephalic tissue at E13 . 5 .
 exencephalic, anencephaly, exencephalic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 exencephalic, anencephaly, exencephalic