Advantages and Disadvantages to Embryonic and Adult Stem Cells. Host rejection minimized Possibility of rejection?? Difficult to isolate in adult tissue. Easy to obtain but blastocyst is destroyed Less Stable. Capacity for self-renewal is limited. Stable. Can undergo many cell divisions. “ Multipotent” (“can become many but not any”) “ Pluripotent” (can become any cell) Adult S.C. Embryonic S.C.
- Embryo cloning is a relatively new technique. It is used with embryos from the best animals avaliable, or from genetically engineered embryos which are capable of producing human medicines in their milk. It is a big step on from embryo transfer.
- In embryo transfer the best animals are stimulated by hormones to release many fertile eggs at the same time. The eggs are fertilised and the early embryos are then flushed out of the uterus of the biological mother and transplanted into a number of surrogate mothers. Using this technique, some cows have produced fifty calves a year!