A common variation in deiodinase 1 gene DIO1 is associated with the relative levels of free thyroxine and triiodothyronine - Panicker,V; Cluett,C; Shields,B; Murray,A; Parnell,KS; Perry,JRB; Weedon,MN; Singleton,A; Hernandez,D; Evans,J; Durant,C; Ferrucci,L; et al. (JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM, 2008)