JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Scientist examining a nucleotide sequencing autoradiograph of DNA taken from the nematode worm Caenorhabditis elegans. DNA sequencing is most usefully performed on sections of DNA called genes that encode specific proteins. The work is being conducted as part of a project to decode the worm's genome, the full set of genes expressed by its chromosomes. The first phase of the project, mapping genes and other markers on chromosomes, was completed in 1990. The final phase, decoding the DNA sequences of genes on all the chromosomes, will, once completed, allow a full "blueprint" of genetic information for C. elegans to be constructed.
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