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.
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Tata UK's chief executive told ITV News they have great faith in the Port Talbot workers helping to make the company a success.
First Minister Carwyn Jones told ITV News the deal between Tata and the unions
Steel unions say Tata Steel has made a commitment securing the future of jobs and production at Port Talbot and other UK sites.