3. Each newly baked flapjack contains a small amount the naturally of tracer occurring stable isotope of carbon (c13) which can be detected by a breath test once it has been eaten. 4. That allows doctors to detect whether and how quickly the cake has been absorbed into the patient's system. 5. The results can indicate whether patient is suffering from a bowel disorder that impairs the digestion of medication used to treat diabetes, irritable bowel syndrome and Aids. 6. Alan Clark, who runs the bakery with his sons, Jonathan and Alan, said, "We are delighted that our bakery is part of the medical research and discovery for which Dundee is famous. This new Dundee cake embodies all the exciting development in the city." 7. It is hoped the new method could become a widespread alternative to using radioactive tracers, which are expensive and risky for large-scale screening, 8. Jim Houston, director of research and innovation services at the university, said, "The success of this project is due to the baking skills of Alan Clark and his precision in manufacturing the flapjacks to the exciting standards required by the pharmaceutical sectors.