A typical tissue engineering solution consists of a number of parts as alluded to above. This article will discuss each part in turn, along with its implications.
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The cells may come from either the same body as they will be reimplanted (autologous), from another body to that in which they will be implanted (allogenic), or from another species (xenogenic). Autologous cells have the fewest problems in terms of rejection and pathogen transmission—however in the case of genetic disease, such cells are not available in a suitable form, and in the case of severe burns, for example, the cells will not be available in sufficient quantities. Autologous cells also have a time delay associated with them, during which time the cells are cultured and multiplied - this means autologus solutions cannot be fast.
For more information upon the sources of cells see this article on cell selection for tissue engineering.