Biotechnology US clinical-stage biotech Magenta Therapeutics’ shares closed down more than 9% at $8.07 on Wednesday, after the company revealed it has received a clinical hold letter from the US Food and Drug Administration related to its Investigational New Drug Application (IND) filed in June 2021 to initiate a Phase I/II clinical trial of MGTA-117 in patients with acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS). 22 July 2021