Bio-engineered tissues and organs have thus far needed scaffolds, but scaffolds degrade, and degradation byproducts can be toxic. Now, scientists have developed a new process that enables 3D printing of biological tissues and organs without needing scaffolds, using “ink” made up of only stem cells.

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Bio-engineered tissues and organs have thus far needed scaffolds, but scaffolds degrade, and degradation byproducts can be toxic. Now, scientists have developed a new process that enables 3D printing of biological tissues and organs without needing scaffolds, using “ink” made up of only stem cells.