G463A is a known human SNP found in hENT3 and associated with the autosomal recessive disorders H syndromes, pigmentary hypertrichosis and non-autoimmune insulin-dependent diabetes mellitus (PHID) syndrome, familial Rosai-Dorfman disease, and histiocytosis-lymphadenopathy plus syndrome [15]. Here, SLC29A3 is linked to H syndrome.