A specific cell, a Gata6+ pericardial cavity macrophage, helps heal an injured heart in mice. The cell was discovered in the pericardial fluid (sac around the heart) of a mouse with heart injury. The same cells were also found within the human pericardium of people with injured hearts, confirming that the repair cells offer the promise of a new therapy for patients with heart disease.Not a stem cell, just an immune-system cell that is generated when the heart is injured. It seems to be designed to work on the outside surface of the heart. Therapies or drugs might be able to boost or focus these cells.
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