Ultragenyx Pharmaceutical, Inc. is a biopharmaceutical company, engaged in the identification, acquisition, development and commercialization of novel products for the treatment of serious rare and ultra-rare genetic diseases. Its products include Mepsevii and Crysvita. Mepsevii is an intravenous enzyme replacement therapy, which is used for the treatment of Mucopolysaccharidosis VII. Crysvita is an antibody administered via subcutaneous injection used for the treatment of XLH. The company was founded by Emil D. Kakkis on April 22, 2010, and is headquartered in Novato, CA.