Researchers at Cardiff University say preventing a form of diabetes could become a reality, if trials prove successful.
It aims to slow - or stop - the destruction of insulin-making cells using a vaccine-type treatment.
In the UK, Type 1 diabetes is on the increase.
David Wood reports.
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The Lesbian, Gay, Bisexual and Transgendered communities in Cardiff are celebrating 30 years of campaigning; as part of LGBT History Month.