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Christian de Duve, a renowned Belgian cytologist and biochemist, passed away in 2013. His groundbreaking research on the structure and function of cells earned him the Nobel Prize in Physiology or Medicine in 1974. De Duve's discoveries, including the identification of lysosomes, peroxisomes, and glyoxysomes, significantly advanced our understanding of cellular processes. His legacy continues to inspire scientists in the field of cell biology.