Fig.10 Quantitation of NO produced by RAW264 cells (a murine macrophage cell line) by using liposome PTIO with ESR spectroscopy. (A) Spectra observed with liposome PTIO incubated with RAW264. Note the effect of an NOS inhibitor (L-NMMA) in (b), which leads to almost complete inhibition of NO. (B) Time profile of NO production by RAW264 cells stimulated with LPS and IFN-ƒÁ, both added at time zero.