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Jim al-Khalili talks to biologist John Sulston about sequencing the genome first of a worm and then of man.

When, as a young man, John Sulston first decided to sequence the DNA of a worm, many of his fellow scientists thought he was wasting his time. It took twenty years of painstaking research but it paid off handsomely. Sulston's research on this humble worm led to one of the most significant scientific breakthroughs of the modern age - the sequencing of the human genome. Jim al -Khalili talks to Sulston about the highs and lows of doing genetic research; fighting to keep scientific findings in the public domain; protecting human health against corporate wealth; and having his DNA portrait done.

Producer: Anna Buckley.