Sentence:  In the presence of a low iodine intake , thyroglobulin labelled in vivo with * * f is found to contain more <WSD>mono-iodotyrosine</WSD> than normal , the amounts of di-iodotyrosine and iodothyronines being correspondingly reduced . 
Meaning of the word marked with <WSD> tags:  tyrosine with one iodine atom added