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LyCEP immunoreactivity in the pericard. A strongly immunoreactive axon bundle (arrows) runs through the pericard (P). Inset, Occasionally small branches arise from this tract (asterisk, out of focus in this micrograph), penetrate the layer of mesothelial cells (Me; arrowhead), and project toward the pericardial cavity (Pc), which may suggest that the immunoreactive material is released into this cavity. A, Atrium. Scale bar: 100 μm; inset, 5 μm.
