Studies of patient tissue and experiments using mice have linked a specific enzyme to both infertility and miscarriage.
Researchers have shown that they can treat sickle-cell anaemia in mice by switching on a haemoglobin gene usually only active before birth.
Watch the 'Of Mice and Men' videos to see how GM mice are used to study human disease.
A common cancer treatment has been shown to be more effective and less toxic when administered at more frequent, lower doses.
Scientists have uncovered an intriguing signalling pathway linking cancer and diabetes.
Scientists have found that the growth of Medulloblastoma brain tumour cells in mice can be significantly slowed using existing anti-viral medicines.
Scientists have successfully guided mouse stem cells to become specialised cells that build a protective coat around neurons.
Experiments on mice have identified the missing link that allows the nervous and immune systems to communicate.
Scientists working with mice have identified a molecule that appears to cause the dementia suffered by Alzheimer's patients.
Rates of diabetes have doubled in the last 30 years and doctors say rising levels of obesity are the main contributing factor.
Antibiotics such as penicillin can be used to treat all sorts of bacterial infections, but doctors have few options when it comes to viral infections.
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