Schunter et al. genotyped 281 patients with variable autoimmune endocrinopathies, including HT, Graves' disease, type 1 diabetes, Addison's disease, autoimmune polyglandular syndrome (APS), and vitiligo, along with 1858 controls, and found a correlation with forkhead transcription factor D3 (FoxD3), a gene involved in embryonal melanogenesis. The gene discussed is FOXD3; the disease is hematocrit.