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The percentage of different types of interstitial cells in the human atrial tissue and their variation on ageing processes. EC – endothelial cells; SMC – pericytes/vascular smooth muscle cells; Sch – Schwann cells; Fb – fibroblasts; Macro – macrophages; TC – telocytes; pSC – putative stem cells. The values for TCs and pSCs are as follows: * 0.6% in newborns; 0.7% in children and 0.5% in adults; # 0.5% in newborns; 0.2% in children and 0.1% in adults.
