The function of Ensembl gene identifier ENSG00000009765 (IYD, iodotyrosine deiodinase) is as follows. Catalyzes the dehalogenation of halotyrosines such as 3- bromo-L-tyrosine, 3-chloro-L-tyrosine, 3-iodo-L-tyrosine and 3,5- diiodo-L-tyrosine (PubMed:15289438, PubMed:18434651, PubMed:25395621, PubMed:28157283). During thyroid hormone biosynthesis, facilitates iodide salvage by catalysing the oxidative NADPH-dependent deiodination of the halogenated by-products of thyroid hormone production, monoiodotyrosine (L-MIT) and diiodotyrosine (L-DIT) (PubMed:15289438, PubMed:18434651). The scavanged iodide can then reenter the hormone- producing pathways (PubMed:15289438, PubMed:18434651). Acts more efficiently on 3-iodo-L-tyrosine than 3,5-diiodo-L-tyrosine (PubMed:15289438). {ECO:0000269|PubMed:15289438, ECO:0000269|PubMed:18434651, ECO:0000269|PubMed:25395621, ECO:0000269|PubMed:28157283}.