MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Human cloning. Conceptual computer artwork of two identical female faces representing human cloning. Parts of the double helix of the DNA (deoxyribonucleic acid) molecule run down left, right and centre. The sequence of the nucleotide bases of this molecule forms a unique genetic code that controls the individual development and functioning of every living organism. The code has four units, the bases adenine (A), guanine (G), cytosine (C) and thymine (T). Their sequence is a unique identifier, like a fingerprint (left), and can be written using the letters ACTG (right). Clones are genetically-identical copies, created using genetic material from a template person.
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