'DNA Typewriter' records cells' history in developing mouse embryo

Scientists reconstructed the family tree of cells in a developing mouse embryo using a 'DNA typewriter' technique. Recording spanned from the fertilized egg's first split to organ formation — 13.5 days of the 19–21 day full gestation in mice.

• Recording covered 13.5 days of mouse embryo development
• Full mouse gestation lasts 19 to 21 days
• Method tracks cell relationships from the egg's first division