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Cut open along its length, this mitochondria cutaway shows the classic bean shape and its deeply folded inner cristae. A smooth outer membrane wraps a separate inner membrane that forms the wavy folds. The folds rise and fall like ribbon inside the matrix, clearly showing how the inner surface area is packed into a small space. The outside has a softly pitted texture. It is a familiar favorite for biology classrooms, a study aid for students learning cell energy, and a clean display piece for any science shelf.

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