Nucleic-acid hybridisation techniques are a central tool for the genetic an
alysis of biological systems. Gene chips are complex arrays of recombinant
plasmids or oligonucleotides immobilised on a glass chip of only 1 cm(2). T
his technology allows, for the first time, the multiparallel expression-ana
lysis of thousands of genes. Gene chips will be indispensable tools for the
upcoming analysis of the human genome, once the entire sequence is known.