Safety and Efficacy Study of MRE0094 to Treat Chronic, Neuropathic, Diabetic Foot Ulcers

Inclusion Criteria: Participants included in the study must: * Have type 1 or type 2 diabetes mellitus. * Have problems with the nerves in their feet. * Have an ulcer on the bottom surface of their foot that has been present for 3 weeks or more and is of sufficient size to qualify for the study. * Be able to apply study drug to their ulcer, or have a caregiver do it. * Be able to visit the doctor regularly during the 4½ month study. Exclusion Criteria: Participants may not participate in the study if: * Their ulcer is caused by bad blood flow to their foot. * Their ulcer is infected. * They cannot wear a special boot during the study to take pressure off the ulcer. * They have certain other diseases, or are using certain types of drugs.