The SLC family of riboflavin transporters (RFVT, SLC52) (Yonezawa and Inui, 2013) has been linked to multiple acyl-CoA dehydrogenase deficiency (MADD), an autosomal recessive disorder mainly affecting amino acid and fatty acid metabolism, and Brown-Vialetto-Van Laere Syndrome, a rare autosomal recessive neurologic disorder characterized by sensorineural hearing loss and a variety of cranial nerve palsies. The gene discussed is CCL21; the disease is multiple acyl-CoA dehydrogenase deficiency.