U.S. regulators asked Sarepta Therapeutics on Friday to voluntarily halt shipments of its Elevidys gene therapy after a muscular dystrophy patient who received a different, experimental treatment died,

Shares of Sarepta Therapeutics Inc (NASDAQ:SRPT) plunged 10% after the company disclosed that the U.S. Food and Drug Administration (FDA) has imposed a clinical hold on several of its gene therapy programs targeting limb girdle muscular dystrophy (LGMD).

As the controversy over the safety of Sarepta Therapeutics’ gene therapies comes to a head, the biotech is standing firm behind its approved Duchenne muscular dystrophy (DMD) treatment.  | As the controversy over the safety of Sarepta Therapeutics’ gene therapies comes to a head,