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This protocol is a flow cytometry-based method to measure the phagocytosis efficiency of necroptotic target cells by bone marrow-derived dendritic cells (BMDCs) in vitro (Aaes et al., 2016). The method is a slightly modified and updated version of the protocols used in previously published papers (Krysko et al., 2006; Brouckaert et al., 2004). In brief, the target cells are labeled with a CellTrackerTM dye before they are induced to undergo cell death. After a co-culture period of 2 h with BMDCs, the cells are immunostained with a dendritic cell marker and dead cell marker, and the phagocytic efficiency is quantified using a flow cytometer. This protocol can readily be used for target cells undergoing cell death modalities other than necroptosis.