<qa>  What is the target venous leg ulcer identified at screening?A target venous leg 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 leg; 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: 15cm2 of least 4 weeks duration in post debridement. 