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Astrocyte morphology is far more complex than initially appreciated. Astrocytes in an organotypic slice preparation labeled with the common marker GFAP (red) overlaid with a single astrocyte transfected with the membrane marker Lck-GFP (green fluorescent protein). Arrow indicates GFAP label of Lck-GFP–marked astrocyte. [From (53) with permission from Elsevier]
