(B) Lineage tracing using the initiator caspase sensor act-DBS-S-QF (14 days of tracing) combined with QUAS-FLP and act>FRT>lacZ are visualized by ßGalactosidase (ßGal, green). ISCs are labelled by anti-Dl (red, insets). Red arrowhead points to the ISC. Gut is counterstained with DAPI (blue) and DAPI (grey, in the inset). Data information: Scale bars, 100µm 