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There are 3.1 billion letters in the DNA code of each of the 100 trillion cells in the human body

Four nitrogenous bases of the DNA alphabet, represented by the letters A, C, G and T and arranged in pairs, carry the instructions for making all organisms. Each block of three letters corresponds to a single amino acid

There are 20 different amino acids used in an array of combinations to produce proteins as different as keratin in hair and haemoglobin in blood

At 30,000 to 40,000, humans have far fewer genes than expected. The nematode worm has 18,000

Between humans, DNA differs by only 0.2 per cent

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