50.3 MB (319.1 KB compressed)
5226 x 3366 pixels
44.2 x 28.4 cm ⏐ 17.4 x 11.2 in (300dpi)
PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY PR. PHILIPPE VAGO, ISM / SCIENCE PHOTO LIBRARY
Light micrograph of the chromosomes (karyotype, with G banding) of a female with Down's syndrome. Humans have 46 chromosomes arranged in 23 pairs. Down's syndrome (trisomy 21) is caused by three copies of chromosome 21; a female has two X sex chromosomes. Down's syndrome results in mental retardation and flattened facial features.
Model release not required. Property release not required.