Trial of Cell Based Therapy for DMD

Inclusion Criteria: * Duchenne muscular dystrophy, diagnosed by mutations in the DMD (dystrophin) gene and/or absence of immunohistochemical staining for dystrophin on muscle biopsy * Non-ambulatory * Intact extensor digitorum brevis (EDB) muscles bilaterally * Off investigational therapies for \> 30 days * Age 18 years of age or older at the time of consent * Have adequate organ function confirmed by the following laboratory values obtained within 14 days prior to enrollment (28 days for cardiac and pulmonary function): * Participants with partners of childbearing potential must be willing to use at least two forms of effective birth control (one form must be a barrier method) while receiving the study product and for 3 months after stopping tacrolimus therapy. * Ability to follow commands sufficiently to perform voluntary aspects of outcome measures throughout the study period * Willing to consent to monitoring for 15 years, including an extension period, as required for all interventional studies involving the transplantation of cells that have been genetically modified * Voluntary written consent from the subject or parent(s)/guardian(s) and assent from participant prior to the performance of any research related activity. Exclusion Criteria: * Presence of HLA antibodies directed toward HLA antigens on MyoPAXon * Active treatment with another investigational therapy * Known allergy to MyoPAXon components