In general, the T cell phagocytosis assay can be divided into two categories, in vivo and in vitro. Both of them are always based on fluorescence. In vivo assay has advantages to be more useful and credible, while in vitro phagocytosis assay could give insights during an early stage in a very short timeline. https://www.creative-biolabs.com/car-t/cellrapeutics-phagocytosis-assay.htm