23643
The model was extended to describe perchlorate , an environmental and food contaminant , that competes with the sodium iodide symporter protein for thyroidal uptake of iodide .
 Chemical: perchlorate; Chemical: sodium iodide; Chemical: 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: perchlorate; Chemical: sodium iodide; Chemical: iodide