22639
Methods : C57BL / 6 mice were fed a normal diet ( control group ) or a low iodine diet supplemented with 0 . 15 % propylthiouracil ( PTU / LI group ) for 4 weeks .
 Chemical: iodine; Chemical: propylthiouracil; Chemical: PTU
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: iodine; Chemical: propylthiouracil; Chemical: PTU