One could be forgiven for thinking that the fuss about the human genome was over. Five years ago, the politicians gave the beaming scientists a collective slap on the back and champagne corks were popped. But after the hangovers cleared, the scientists had to go back to their labs and do the job properly. The "draft" sequence they had released was just a landmark along the way. Gradually the details of each human chromosome have been emerging. A chromosome is a set of instructions, in the form of genes, that are used in creating an organism. This week scientists have reported in the journal Nature that they have finally finished sequencing the X chromosome.
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