BSIP, LAURENT H.AMERICAIN / SCIENCE PHOTO LIBRARY BSIP, LAURENT H.AMERICAIN / SCIENCE PHOTO LIBRARY
Down's syndrome. Fluorescence in situ hybridis- ation (FISH) micrograph of Down's syndrome chrom- osomes (red) within a foetus' cell nucleus (blue). Down's syndrome is the result of an extra copy of chromosome 21. Normally, there are only two copies of this chromosome in each nucleus. Chromosomes contain the genetic code. Down's syndrome is a genetic disease that is characterised by mental retardation and typically flattened facial features. FISH allows individual chromosomes within cell nuclei to be tagged with a fluorescent dye. Magnification unknown.
Model release not required. Property release not required.