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Scientists at the Amrita Centre for Nanosciences and Molecular Medicine at Amrita Vishwa Vidyapeetham, Kochi, have come a step closer to using photodynamic therapy for treating residual cancer cells of a high-grade brain tumour (glioblastoma). Photodynamic therapy uses a photosensitive drug that becomes active under the action of light and converts molecular oxygen into reactive oxygen species that kill cancer cells.