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Extents of the lumbar spinal injection sites.A–C, Images showing the maximal extent in the transverse plane of the FG application sites. Images were taken from the three rats used for quantitative studies; labeling is predominantly in the superficial dorsal horn. D, Camera lucida drawings showing the rostrocaudal extent of the largest of the application sites (rat AK 71). Shaded areas on drawings represent the extent of FG labeling at different lumbar levels.
