Figure 4: Blue light does not decrease microglial cell viability or promote apoptosis.

N9 microglia were exposed to blue light (450 nm) for 1 second per minute for 6 hrs at the indicated energy doses and assayed immediately following or 18 hours post-exposure. Viability (left panel) and apoptosis (right panel) are graphed as means + 1 SEM assessed relative to the no light controls (0 mJ/cm2). No statistically significant differences in viability or apoptosis were detected.