Key points from article :
One team reprogrammed skin cell derived iPS cells with seven transcription factors.
Progenitor cells are tantalizingly close to natural haemopoetic blood stem cells.
Another team used four transcription factors to directly convert cells from the lining of blood vessels.
Aimed at patients who need bone-marrow transplants, but could also prevent depletion as we age.
The study was published in the Nature journal.
