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Fig. 1. Candidate cell fractions from E11.5-E13.5 embryonic organs were purified by
flow cytometry and transplanted into lethally irradiated adult recipients.
High-level (>5%) long-term multi-lineage contribution to haematopoiesis was
determined after 24 weeks. Path `a' represents the transplantation of freshly
dissected organs, whereas path `b' indicates the additional 3-day explant
culture step prior to transplantation.