RIP-Cre/ER and pTrip–loxP-NEO-STOP-loxP-eGFP lentiviruses [3 (link)] were used for lineage tracing. Virus production, cell infection, and tamoxifen treatment were previously described [3 (link)]. eGFP-labeled cells were sorted using a FACS Aria sorter (BD Biosciences) as described [2 (link)].
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