Biggest problem right now with artificial genetically produced are how they will initiate DNA replication and who's to use for the original blueprint. I don't see anything being ready for 15-20 years, but in all likelihood much longer based in a large part what Allison mentioned, cost factor. There is just not a demand right now. Transplants have been attempted as well as Uterine transplants, but the rejection factor hasn't been solved. I believe the last Uterine transplant into a MtF test subject were rejected 4 days Post Op.