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lls in 2020 How Does It Work? Uses bioink, mixture of stem cells Printer moves back and forth dropping out one bioink particle at a time to form one layer Printer prints out one layer of cells at a time on biopaper, which is made up of collagen, water, and hydrogels Layers are printed one top of each other After cells fuse, biopaper is removed Current Developments: Doctor Anthony Atala Director at Wake Forest Institute of Regenerative Medicine and a surgeon Part of the team that created first functional artificial bladder to be implanted in a human In 2020, successfully printed a kidney from human cells in seven hours