<qa>  What is the target foot ulcer identified at screening?A target foot ulcer is identified at screening and patient eligibility is confirmed at screening and then again at the beginning of the Day 0 baseline visit. A patient enrolled in the study may have multiple ulcers on the same or either foot; in this case, all ulcers will be treated with Granexin gel, but only ulcers meeting the following criteria will be designated as the target ulcers and will determine eligibility: 4cm2 in post debridement of at least 4 weeks duration. 