JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Decoding the genome, or genetic blueprint, of the nematode worm Caenorhabditis elegans. Fragments of DNA extracted from this tiny worm 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. This print-out shows readings of the emitted fluoresence from the dyes. The results are colour-coded: cytosine (blue), guanine (black), adenine (green) and thymine (red).
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