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A miniature blood vessel, formed on agarose/gelatin hydrogel. Green represents VE-cadherin, a protein that glues cells together, and blue is nuclei. Courtesy of Yongzhi Qiu.

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A miniature blood vessel, formed on agarose/gelatin hydrogel. Green represents VE-cadherin, a protein that glues cells together, and blue is nuclei.  Courtesy of Yongzhi Qiu.