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Polylox barcoding reveals haematopoietic stem cell fates realized in vivo

Developmental deconvolution of complex organs and tissues at the level of individual cells remains challenging. Non-invasive genetic fate mapping has been widely used, but the low number of distinct fluorescent marker proteins limits its resolution. Much higher numbers of cell markers have been generated using viral integration sites, viral barcodes, and strategies based on transposons and CRISPR–Cas9 genome editing; however, temporal and tissue-specific induction of barcodes in situ has not been achieved.
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