Genes & Cells

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Leonardo the duck-billed dino

MORE THAN BONES  A 77-million-year-old duck-billed dinosaur nicknamed Leonardo may have been infected with parasitic worms.

cell and fertilized egg with mitochondria

BREAK DOWN  Like most cells, sperm contain energy-producing mitochondria (one organelle and its membrane (red circle) shown, left). Once a sperm fertilizes an egg, the sperm’s mitochondria break down inside that membrane (right).

Genes & Cells

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