Individual cells in your body are constantly being replaced ... Miniature, 3D versions of testicles also make it to the list of body parts that scientists have grown in the lab.

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A Japanese team has developed a technique to insert chloroplasts isolated from algae into animal cells, a feat that could revolutionize sustainable energy and how artificial meat and organs are ...

The growth of new segments (body parts) in marine worms is controlled by a special growth zone, in which special stem cells are located. New segments then emerge by the division of these cells.