Patients With Intermittent Claudication Injected With ALDH Bright Cells

Inclusion Criteria: 1. Patients with atherosclerotic peripheral artery disease with classic claudication (exercise-induced pain, cramps, fatigue, or other equivalent discomfort involving large muscle groups of the leg(s) that is consistently relieved by rest) or atypical leg pain (exertional leg pain that does not begin at rest or does not resolve consistently with rest) as defined by the San Diego Claudication Questionnaire. 2. Age ≥40 years 3. Resting ankle-brachial index \<0.90 or a resting toe-brachial index of \<0.70 at baseline testing 4. Presence of significant stenosis or occlusion of infrainguinal arteries including the superficial femoral artery, popliteal artery and/or infrapopliteal arteries as determined by: Duplex ultrasound imaging (occlusion or focal doubling of peak systolic velocity of one or more affected segments) OR lower extremity computed Tomography Angiography (CTA) OR lower extremity magnetic resonance angiography (MRA) OR lower extremity catheter-based contrast arteriography. Each of these noninvasive and invasive anatomic assessments will identify patients with at least a 50% stenosis in the affected segment. Exclusion Criteria: 1. Presence of any musculoskeletal disease, cardiac or pulmonary disease, or neurological disease that limits the patient's ability to walk to fulfill protocol requirements (claudication must be the consistent primary exercise limitation) 2. Inability to complete treadmill testing per protocol requirements. 3. Ability to walk for more than 12 minutes on the treadmill during treadmill testing. 4. Patients who identify both legs as equivocally symptomatic or alternate between symptomatic legs on the baseline treadmill tests. 5. Patients with critical limb ischemia (ischemic rest pain or ischemia-related non healing wounds or tissue loss (Rutherford categories 4-6). 6. Recent (\<3 months) infrainguinal revascularization (surgery or endovascular revascularization) or revascularization planned during study period 7. Patients with a patent infrainguinal bypass graft in the index limb, with or without evidence of a hemodynamically significant stenosis or other defect (kinking, pseudoaneurysm, or fistula). Patients with an occluded infrainguinal bypass graft or a patent aortobifemoral or femoral-femoral bypass graft are NOT excluded. 8. Patients with \>2+ lower extremity pitting edema 9. Patients with myelodysplastic syndrome (MDS) 10. Patients who are pregnant or lactating, planning to become pregnant in the next 12 months, or are unwilling to use acceptable forms of birth control during study participation. 11. Congestive Heart Failure hospitalization within the last 1 month prior to enrollment 12. Acute coronary syndrome in the last 1 month prior to enrollment 13. Human Immunodeficiency Virus positive, active Hepatitis B Virus or Hepatitis C Virus Disease 14. History of cancer within the last 5 years, except basal cell skin carcinoma 15. Any bleeding diathesis defined as an International Normalized Ratio ≥ 2.0 (off anticoagulation therapy) or history of platelet count less than 100,000 or hemophilia 16. Contraindication to magnetic resonance imaging (MRI) (including knee/tibial/fibular replacement hardware in the index leg) or known allergy to MRI contrast media 17. Chronic kidney disease \[effective Glomerular Filtration Rate \<30 by modification of diet in renal disease (MDRD) or Mayo or Cockcroft-Gault formula\] 18. Uncontrolled diabetes \[Hemoglobin A1C (HbA1C)\>8.5\] 19. Planned change to (initiate or terminate) active involvement in a supervised exercise program (e.g., with a trainer, exercise protocol, and goals, such as in a peripheral arterial disease, cardiac or pulmonary rehabilitation program) during study participation 20. Plans to change medical therapy during the duration of the study, (i.e. patients who use cilostazol should remain on a stable dose for four weeks prior to enrollment and should not change doses for the 6 months of the study duration.) As always, cilostazol can be discontinued if new heart failure or intolerance occurs during study participation. 21. Any condition requiring immunosuppressant medications (e.g., for treatment of organ transplants, psoriasis, Crohn's disease, alopecia areata). 22. History of inflammatory or progressively fibrotic conditions (e.g. rheumatoid arthritis, systemic lupus erythematosis, vasculitic disorders, idiopathic pulmonary fibrosis, retroperitoneal fibrosis). 23. Patients with any untreated stenosis \> 70% of the distal aorta, common iliac, or external iliac arteries by CT, Angiography or MRI imaging will be excluded from enrollment (patients with previously successfully revascularized inflow stenoses may enroll in PACE). Subjects who were screen failures for a flow-limiting proximal lesion may be rescreened 3 months after successful angioplasty/stenting. 24. Inability to provide written informed consent due to cognitive or language barriers (interpreter permitted) 25. Concurrent enrollment in another clinical interventional investigative trial. 26. Presence of any clinical condition that in the opinion of the principal Investigator or the sponsor makes the patient not suitable to participate in the trial