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Two-channel in vivo image using implanted GRIN lens. Image is from prefrontal cortex of an adult GFAP-GFP mouse implanted with a 350-μm diameter GRIN lens. Texas red-dextran dye was injected into the tail vein to visualize the vasculature. A few glial cells expressing GFP under the GFAP promoter can be seen near one of a blood vessel near the center of the image. A Gaussian filter with σ = 1.33 was applied to all channels to reduce background noise. Scale bar denotes 5 μm.
