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A, the percentage of collagen in the right ventricle of 14.5‐month‐old male sheep born at term (147 days gestation) or preterm (132 days gestation). B and C, representative images of Picrosirius Red stained myocardial sections from term (B) and preterm (C) animals, with collagen shown in red and myocardium in yellow. Scale bars = 100 μm.
