19813
The ETTAG was histologically indistinguishable from normal orthotopic thyroid tissue , and its follicular nature was confirmed by immunohistochemical positivity for thyroglobulin , thyroperoxidase , thyroid transcription factor - 1 ( TTF - 1 / Titf - 1 / Nkx2 . 1 ) , cytokeratin ( CK ) AE1 / AE3 , CK 7 , pendrin , human sodium iodide symporter ( hNIS ) , paired box gene 8 ( PAX8 ) and FOXE1 ( TTF - 2 ) , as well as positivity for the messenger RNA of the thyroglobulin gene by in situ hybridization analysis .
 Chemical: sodium iodide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sodium iodide