Figure 3. Corneal fluorescein staining in BTX-B injected and normal control mice. A-C: Corneal staining was seen in BTX-B injected mice 1 week, 2 weeks, and 4 weeks post-injection, respectively. D-F: No corneal fluorescein staining was noted in normal control mice, saline-injected mice 1 week and 2 weeks post-injection, respectively.