A child conceived through selective in vitro fertilization as a potential source of donor organs or cells for an existing brother or sister with a life-threatening medical condition.
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The change in the law would have been welcome news for parents with children suffering debilitating conditions such as blood disorders who wish to create a "saviour sibling" through fertility treatment.
The 5 million centre will bring pioneering embryo screening techniques for the creation of "saviour siblings" to Britain.
As well as embryo research, there were further clashes over moves to allow parents with a sick child to create a "saviour sibling" to be harvested for cells to cure their older brother or sister.
MPs went on to debate plans to allow the creation of saviour siblings, where parents use fertility treatment to select an embryo which is a genetic match to a sick older child.
We don't know what the social and emotional consequences of being a so-called "saviour sibling" will be.
Should children who face death or critical illness find new hope in scientific advances that would allow their new brother or sister to be not just a blessing to their family, but also a saviour sibling to them?
They were hoping to help their daughter with a saviour sibling.
Creating a "saviour sibling" involves creating five or six embryos, testing them to find a genetic match to the sick child, and implanting only that embryo in the womb.
He is the son of the couple who won the controversial right to create a "saviour sibling" to treat the rare blood disorder which threatens his life.
The clauses relating to hybrid embryos and saviour siblings are expected to pass but the scrapping of a requirement for a father could fail.
In 2001 his parents won the right to create a saviour sibling to help cure him from the potentially fatal blood disorder.
The predictions on the votes about saviour siblings and the hybrid stem cells were largely right.
He said his clinic, a leading centre for these techniques, has one patient who is pregnant with a saviour sibling and four women about to start treatment.
She does not hesitate when asked whether she would create a "saviour sibling" if her own child was seriously ill.
Once the saviour sibling is born, blood from the umbilical cord is collected and can then be used for a stem cell transplant.
For example, the committee suggests having a more permissive attitude to the creation of 'saviour siblings'.
As the saviour sibling will almost certainly be required to donate at a young age, there are also concerns at the inability to give informed consent.
Adam was the first ever "saviour sibling", created to help save his sister's life.