Figure 1 of Johnsen-Soriano, Mol Vis 2012; 18:1604-1608.

Figure 1. Experimental setup. A: Organ culture medium was collected from the upper and lower levels of the storage vials after 7 days and analyzed for MDA. B: Subconfluent human corneal epithelial cell cultures were exposed to medium from the different levels and to control medium for 0, 3, and 7 days before analysis.