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Histology of rat SAN tissue (from the young group). (a) The image of the raw SAN preparation. (b) HE staining of the SAN tissue. (c) Masson staining of the SAN tissue. * indicates SAN artery. CT: crista terminalis; End: endocardium; IVC: inferior vena cava; RA: right atrium; SEP: septum; SVC: superior vena cava. (A color version of this figure is available in the online journal.)
