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Flow Cytometry Protocol The meaning is in the name: Flow = in motion, Cyto = cells, Metry = measure. What is Flow Cytometry? Flow cytometry measures the properties of cells while in a fluid stream. It enables single cell analysis of complex cellular systems (e.g. blood) very rapidly (100s of cells/second) it also allows you to look at various cellular properties such as size, granularity, fluorescence intensity per cell. Flow Cytometry can be used for cell counting, cell sorting, biomarker detection and protein engineering. Cell components are fluorescently labelled and then excited by the laser to emit light at varying wave …