How Do You Grow an Artificial Organ?

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We've figured out how to get all the right cells to grow well and to retain their function, the next step is okay, how do we build it? How do we build this organ? And it's very much like baking a layer cake. You're basically placing these cells in this three-dimensional scaffold, you have to create this three-dimensional scaffold, and then that replicates the architectural and structural properties of the tissue you're trying to replace, and then you start placing those cells on that scaffold layer by layer, and being that the organ, this particular organ has two different cell types, you are placing one cell type on the outside and one on the inside.