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Figure 5 The human atrioventricular groove at the posterior left atrium. A = anterior wall of coronary sinus; AM = atrial myocardium; CS = coronary sinus; LV = left ventricle; En = endocardial surface of the left atrium; Ep = epicardial surface of the left atrium; G = fat of the atrioventricular groove; LA = left atrium; MV = mitral valve annulus; P = posterior wall of coronary sinus.