JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Decoding the genome, or genetic blueprint. Fragments of DNA extracted from the human body (or any other creature) are stored in ethanol contained in the phials visible here. The print- out is from an automatic DNA sequencing machine used to decode the sequence of base-pairs in the DNA fragments. In this method, each of the four bases is labelled with a different fluorescent dye, allowing a laser scanner to differentiate between them. The print-out shows readings of the emitted fluoresence from the dyes. The four bases are colour-coded: cytosine (blue), guanine (black), adenine (green) and thymine (red).
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