23.4 MB (1.1 MB compressed)
3503 x 2332 pixels
29.7 x 19.8 cm ⏐ 11.7 x 7.8 in (300dpi)
PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Genome research: computer displays of (left) a family tree of diseases and (right) a diagram of the principal genes identified (so far) on chromosome 22. Locating the genetic markers of an ever-increasing number of diseases is one of the aims of the human genome project, an ambitious program to map (locate) & sequence (decode the base-pair sequence) of each chromosome. This huge document will be written in a language of only 4 letters, C,G,A & T; the letters that represent DNA's organic bases. Embedded in these billions of characters are those that represent genes, lengths of DNA that express a particular protein or function.
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