3',5'-diiodo-L-thyronine + iodide + A + H(+) = 3,3',5'-triiodo-L-thyronine + AH2
3',5'-diiodo-l-thyronine + iodide + a + h(+) = 3,3',5'-triiodo-l-thyronine + ah2
3',5'-diiodo-L-thyronine + iodide + A + H(+) = 3,3',5'-triiodo-L-thyronine + AH2
3',5'-diiodo-l-thyronine + iodide + a + h(+) = 3,3',5'-triiodo-l-thyronine + ah2