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Variable SHG intensity of individual bipolar cell axons. (a) The mean SHG intensity increases toward the INL. (b) Histograms of the SHG intensity at zero IPL depth of total (gray) and GUS+ (green) bipolar cell axons. The red line shows the maximum likelihood fit to the Gaussian mixture model, which has three components. (c) The SHG intensities along the GUS+ axons (n = 77).
