Study of IL-22 IgG2-Fc (F-652) for Subjects With Grade II-IV Lower GI aGVHD

IV infusion of reconstitution lyophilized F-652.

Prednisone (or equivalent) at the time of the onset of clinical symptoms consistent with GI and/or liver aGVHD, as per the standard of care. Prednisone (or equivalent) will be given at a dose of 2 mg/kg/day and tapered as needed.