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Co-localization of GFP-ir (green) and P2X2 receptor-ir (red) cells in myenteric (a–c) and submucous (d–f) plexus of ileum of Pirt knockout (ko) mice. c, f Merged images from a, b and d, e, respectively. Double-labeled neurons are yellow in color. Scale bars, a–f 200 μm
