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A: Mitochondria aggregated around the nucleus in 1-day-old yak (arrowheads); B: Mitochondria ridge was uniform and well distributed (arrowheads) in 6-month-old yak. C: Giant mitochondria and the irregular ridge in 5-year-old yak (arrowheads). D, E, F: Collagen fibers in the 1-day-old, 6-month-old, and 2-year-old yak heart.
