Raw264.7/RFP cells are derived from the mouse macrophage cell line Raw264.7 by stably integration of a constitutive RFP stably expression construct. Raw264.7 cells have been used as a model for studying the response of inflammatory molecules to various stimuli and evaluating the effects of anti-inflammatory drugs. Raw264.7/RFP cells stably express RFP, can be used for in vitro assays and in vivo imaging.