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WITH all the fuss about the genome, one basic fact continues to surprise.
Every genetic part of us, all the codes for the colour of our skin and eyes, our
propensity for having a double chin or a flat tummy, our risk of getting certain
diseases, comes from the combinations of just four bits. Four bases, nicknamed
A, T, C and G.

Just four. Doesn’t that seem odd to you?

For me, it all sounds suspiciously like the Middle Ages when people believed
passionately that all matter was made from another four bits: earth, air, water
and fire. Well, that…

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