Fig. 5.

Immediate postexposure increases in NO are nNOS independent, while secondary postexposure increases in NO require nNOS activity. Solid line denotes normal control samples, while dotted line indicates cells treated with $450\mu \mathrm{M}$ of nNOS inhibitor SKF-525A. Graph of mean percent changes in NO level ($\mathrm{\Delta }f/f$ DAF-FM fluorescence) ± standard error, relative to time postexposure to $2.88\pm 0.06\mathrm{J}/{\mathrm{cm}}^2$ at $800\pm 17.9\mu \mathrm{W}/{\mathrm{cm}}^2$ of (a) 635-nm red, (b) 808-nm NIR, (c) 532-nm green, and (d) 447-nm blue light.