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. Author manuscript; available in PMC: 2023 Sep 18.
Published in final edited form as: Auton Neurosci. 2013 Dec 23;181:37–48. doi: 10.1016/j.autneu.2013.12.010

Figure 4.

Figure 4.

CGRP-IR axons in the entrance area of the major veins.

All-in-focus projection images of LP-CV (left precaval vein; A), SVC (superior vena cava, B), IVC (inferior vena cava, C) of the right atrium; and PV (pulmonary vein, D) of the left atrium. The bright signal represents CGRP-IR axons and the dim background represents autofluorescent background from muscle layers. CGRP-IR axons in the veins exhibited similar structure of terminal end-nets and free endings as seen in the atria. E: A partial projection of confocal optically-sectioned images showing several axons (arrows) traveling in the epicardium. F: A single optical section showing that delicate CGRP axons (arrows) are in the myocardium and have close contacts with cardiomyocytes. Scale bars in A: 50 μm for A-D; in E and F: 30 μm.