Sentence:  In the presence of a low iodine intake , <WSD>thyroglobulin</WSD> labelled in vivo with * * f is found to contain more mono-iodotyrosine than normal , the amounts of di-iodotyrosine and iodothyronines being correspondingly reduced . 
Meaning of the word marked with <WSD> tags:  an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins