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HA17: Intercalated disk EM

This electron micrograph shows three cardiac myocytes connected by intercalated disks. Myocyte 1 and 3 are electrically coupled by a gap junction (arrow). The dark staining lines are spot desmosomes and actin filaments inserting on the sarcolemma, which is known as a fascia adherens. There are mitochondria in between the myofibrils.