Keywords: Chromosome 21.png de Idiogramm von Chromosom 21 en The human chromosome 21 http //www nichd nih gov/publications/pubs/downsyndrome/down htm National Institute of Child Health and Human Development author PD-USGov Human chromosomes Down syndrome Human chromosome 21 Original upload log wikitable - - 2005-08-09 12 36 58 90 × 171 3254 bytes Lipothymia <nowiki>Medicine pd </nowiki> |