Clever innovation and disciplined engineering are helping to create better, smaller and less expensive flow cytometers.GIACOMO VACCA, KINETIC RIVER CORP.Cells are the building blocks of organisms. From yeast and bacteria to elephants and whales, cells are the fundamental units of both biological structure and function. They have long been the subject of intense study: to better understand how they work, to help develop safer and more effective drug compounds, and to serve as diagnostic proxies of disease. A large vapor bubble in a 250-µm flow cytometer microchannel caused by absorption of high-power green light by fluorescein dye. 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