In 1951 the young British scientist began one of the key scientific investigations of the century. Rosalind Franklin produced an x-ray photograph that helped show the structure of DNA, the molecule that holds the genetic code that underpins all life. The discovery was integral to the transformation of modern medicine and has been described as one of the greatest scientific achievements ever. Farhana Haider has been speaking to Rosalind Franklin's younger sister Jenifer Glynn. Photo: Dr Rosalind Franklin. Credit: Science Photo Library.