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Presenter Geoff Watts
Why does an arm become an arm and not a leg? How does a liver cell know that it is to sit in your abdomen and not in your head? What stops a baby from arriving as a faceless, limbless, brainless blob of cells?
Developmental biologists Professor Lewis Wolpert. Middlesex Hospital Medical School. London, and Dr Chris Wylie, St George's Hospital Medical School, Tooting, describe what takes place when the fertilised egg divides, differentiates, and becomes a fully developed individual.
(Repeated: Wednesday 9.0 pm)