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Immunostaining for IL-4 receptor. IL-4 receptors were present on primary cultures of guinea pig airway parasympathetic neurons (A) and on human neuroblastoma cells (B). Neurons were stained with antibody against IL-4 (green) and DAPI, which stains the nuclei blue. Insets show cells in the absence of primary antibody; only blue DAPI-stained nuclei are visible (10-fold lower magnification). Scale bars: 30 μm.
