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Figure 3 Arrangement of left ventricular fiber sheets and cleavage planes in long-axis slices. (A) Longitudinal cross section of the left ventricle fixed in diastole (hematoxylin and eosin stain). (B) Radial orientation of the cleavage planes and the quantification of diastolic and systolic angles of the sheets and the cleavage planes from the boxed area in A. Reproduced from Chen et al. (33) with permission.