19819
The expression of some transcription factors ( TTF - 1 , PAX8 and FOXE1 ) involved in development and / or migration of the medial thyroid anlage is preserved .
 None
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