Figure 2 of Lin, Mol Vis 2011; 17:2507-2515.

Figure 2. Schematic representation of the proposed pharmacokinetic model. The definition of each term is as follows: Ce: extracellular ECA concentration; Cif: intracellular concentration of free (unbound) ECA; G: intracellular binding site available to ECA; G-ECA: bound ECA; Cib: intracellular concentration of bound ECA; and Pm: permeability coefficient of cell membrane.