Figure 1 of Wang, Mol Vis 2012; 18:255-264.

Figure 1. The transparency and light transmittance of the prepared culturing substrates. A: The lines of graph paper could be easily seen through chitosan, PCL 25, PCL 50, and PCL 75. As for PCL 100, it is remarkable that the prepared culturing substrate became opaque. B: The light transmittance decreased particularly through PCL 100.