Figure 1 of Zhu, Mol Vis 2009; 15:250-258.

Figure 1. Effect of BTX-B on murine tear production. Mean tear production in all groups. Data represents the mean±SEM in all groups. x-axis: time after injection. The reduction of aqueous tear production in BTX-B injected mice persisted during the observation period, but no change in normal and saline-injected control mice.