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  1. 1

    Doris Taylor (right) and her colleague Stefan Kren are creating live bioartificial hearts.
  2. 2

    A pig’s heart in formaldehyde has been stripped of its cells using a strong chemical detergent. The extra­cellular matrix left behind will be seeded with cells to produce a new heart.
  3. 3

    A rat heart in a bioreactor has been chemically stripped of cells and then repopulated with neonatal cardiac myocytes. Suspended in the bioreactor, the new heart receives nutrients; mechanical and electrical cues train it to beat on its own.
  4. 4

    A close-up of the rat heart in the bioreactor shows that it is attached to two catheters responsible for the inflow and outflow of a nutrient solution. The heart is also hooked to two electrodes that train it to contract and expand.

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