Of Mice and Men-Why do researchers believe the intermingling of species

[Rosalinda]

could be vital to science?
UK scientists are seeking permission to place human nuclei into animal eggs in a bid to create stem cell lines
**More on chimeras and hybrids. **

Other methods for creating chimeras include:

• Fusing embryos of different species together;
• Transplanted genes, cells, tissues or organs from one species into another;
• Or injecting stem cells from one species into a developing embryo or an adult of another species.
  Scientists say these interspecies creatures could help science in a number of ways - from making human stem cells and improving animal models to study disease, to one day, perhaps, creating organ or tissue factories for transplants into humans.

How far is too far?
news.bbc.co.uk/2/hi/health/6107796.stm