Scientists have long experimented with organs-on-chips: tiny representations of human organs, such as lungs, hearts and intestines, made from cells embedded on plastic about the size of a computer memory stick. Channels lined by living vascular cells then mimic the body's circulatory system. But our bodies are complex systems of organs, so testing drugs on individual miniature organs only goes so far. Researchers now are aiming for something more: full-blown human bodies-on-chips.
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