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Photomicrographs of activation of dorsal lumbar spinal cord astrocytes by intrathecal gp120. A, C, GFAP labeling of lumbar dorsal horn at 8 and 18 hr, respectively, after intrathecal vehicle. B, D, GFAP labeling of lumbar dorsal horn at 8 and 18 hr, respectively, after intrathecal gp120. Scale bar, 50 μm. veh, Vehicle.
