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Representative photograph showing the colocalization of immunoreactive IL-1RI and Fos in superficial laminae (A) and lamina V (B) of the spinal dorsal horn. Note that the immunostaining product for IL-1RI is localized in cytoplasm and dendrites, while that associated with Fos is present in the nucleus. Arrows indicate doubled-labeled IL-1RI/ Fos neurons. Bars = 50 μm.
