Thanks to this new technique developed by scientists at the Imperial College London, it is now easier to trace tumours. The fluorescent nanotech makes malignant cells light up. As a result, diagnosis becomes easier, more accurate and more reliable. Bioharmonophores are not the first fluorescent instruments. However, it used to be more difficult to distinguish tumours from healthy tissue and the technology was less accurate. The present research focuses on zebrafish embryos, but with additional research the technology can become valuable for human cancer patients as well.