BSIP, LAURENT H.AMERICAIN / SCIENCE PHOTO LIBRARY BSIP, LAURENT H.AMERICAIN / SCIENCE PHOTO LIBRARY
Down's syndrome test. Female technician testing cultured foetal cells for the genetic disease Down's syndrome (trisomy-21). These amniotic cells were obtained by removing some of the amniotic fluid which surrounds the developing foetus. This procedure is called amniocentesis. Amniocentesis is usually performed between the 16th and 18th week of pregnancy. The foetal cells in the fluid are cultured for up to 4 weeks for chromosomal analysis. In Down's syndrome, there are three rather than two copies of chromosome 21. This results in mental handicap.
Model release available. Property release not required.