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It had been also proven that gold nanotubes had been excreted from your body and they are unlikely to trigger problems when it comes to toxicity, an important factor when developing nanoparticles for medical use. Study co-writer Dr James McLaughlan, from the institution of Electronic & Electrical Engineering at the University of Leeds, said: ‘This is actually the initial demonstration of the creation, and use for tumor and imaging therapy, of gold nanotubes that highly absorb light within the 'optical window' of biological cells. ‘The nanotubes could be tumour-targeted and also have a central 'hollow' core which can be packed with a therapeutic payload.