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Axel is very proud of the huge machines called mass spectrometers that he uses for his research. With their help, Axel hopes to discover whether there is something called an epigenetic code and if so, how it is laid down. The epigenetic code is thought to be a level of coding over and above the genetic code in which DNA or proteins that bind to it like histones are chemically altered. It is the chemical alterations of histones or the letters of an epigenetic code that Axel hopes to crack with his version of the Enigma machine.