19821
Conclusion : Although ETTAG pathogenesis remains unknown , the lack of C cells together with the coexistence of a congenital defect of the anterior diaphragm ( hernia of Morgagni ) in one of our patients could suggest an over - descent of medial thyroid anlagen derived cells in the origin of this heterotopia .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None