3,3',5'-triiodothyronamine + iodide + A + H(+) = 3,3',5,5'-tetraiodothyronamine + AH2
3,3',5'-triiodothyronamine + iodide + a + h(+) = 3,3',5,5'-tetraiodothyronamine + ah2
3,3',5'-triiodothyronamine + iodide + A + H(+) = 3,3',5,5'-tetraiodothyronamine + AH2
3,3',5'-triiodothyronamine + iodide + a + h(+) = 3,3',5,5'-tetraiodothyronamine + ah2