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NOVATO, Calif., May 1, 2012 /PRNewswire/ Ultragenyx Pharmaceutical Inc., a biotechnology company focused on developing treatments for rare and ultra-rare genetic disorders, today announced results from a first-in-human, multi-center, Phase 1 study of UX001 in patients with hereditary inclusion body myopathy (HIBM) showing that UX001 was well-tolerated with an expected extended release profile on absorption after oral administration. UX001 is an extended release formulation of sialic acid intended as a substrate replacement therapy for HIBM, a severe, neuromuscular disease caused by sialic acid deficiency. Based on the Phase 1 results, Ultragenyx plans to initiate an international, multi-center, randomized, double-blind, placebo-controlled, parallel group Phase 2 study of UX001 in HIBM patients in the second quarter of this year.