A team of researchers at Cardiff University has discovered stem cells in the cheek can be used to supress the immune system. It should help patients with certain types of diabetes, and those whose bodies reject organs after transplants.
It'll be several years before a treatment's developed but the scientists say it's a real breakthrough.
More top news
Winds are expected to ease this evening and showers will become lighter and more isolated. A drier and brighter day tomorrow.
After nearly six weeks of campaigning the race for Number 10 has reached its final stages.
Polling stations across Wales will open at 7am on Thursday May 7th. Here is a guide on 'how to' and 'how not to' vote.