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thrombus (the stave (polymerized fibrin) + platelets (notes which are on the stave)),
veins with valves (vessel-like end for the guitar),
leukocytes, erythrocytes, pericardium

sinoatrial (SA) node (yellow oval near the left eye),
thrombus (the stave (polymerized fibrin) + platelets (notes which are on the stave)),
leukocytes, erythrocytes, pericardium,
veins with valves (vessel-like end of the guitar).