Furthermore, scientists think they understand the steps they need to take to genetically modify pig tissue so that it will not be rejected by the human immune system.

BBC: New pig clones: PPL Therapeutics

The girl said that in several visits to the toilet in the accident and emergency department she could have undressed herself and did not need help from Mr Thorley to use tissue paper.

BBC: Sex charge head aided toilet girl

If this is the case, you may need prescription antihistamines and nasal sprays, which shrink swollen tissue, as well as corticosteroid nasal sprays, which fight the underlying inflammation.

CNN: Finding relief as spring allergies rage on

Three quarters of people who need a bone marrow transplant fail to get one because they cannot find a tissue match.

BBC: Foetus

Tissue from the cord of new born babies is being recycled by doctors to help patients who need a bone marrow transplant, but who cannot find a match.

BBC: Foetus

"People from ethnic minorities need to come forward and to help children such as Zain in the hope that they may be a tissue match and actually cure his condition and save his life, " he said.

BBC: NEWS | Health | Boy wants minority marrow donors