Figure 2 of
Yang, Mol Vis 2007;
Figure 2. The effect of microglia cell conditioned medium on 661W photoreceptor cell apoptosis
A: 661W cells grown in the basal medium displayed no TUNEL-positive labeling. B: After exposure to microglial cell conditioned medium for 24 h, 37% cells underwent apoptosis, as determined by TUNEL study (arrow).