Scientists advanced the possibility of reproducing the body's organs by using 3D printing. Scientists could make organs by using bio-printing. Scientists could create networks of thin tubes, like those used in our body to let blood flow. These are called vascular networks. A bio-engineer said one problem to create tissue replacements has been an inability to print complex vascular networks that can supply nutrients to tissue.
Another professor wrote about the difficulty of recreating vascular networks. She said: "Tissue engineering has struggled with this for a generation." She said: "If we can print tissues that look and now even breathe more like the healthy tissues in our bodies, will they also then functionally behave more like those tissues?" She said bio-printing could become a popular therapy. Scientists hope this method will help millions waiting for organ transplants.