Human chromosomes. Meters of DNA are packed into micrometer-sized chromosomes in mitosis, here in human (HeLa) cells arrested in mitosis. Chromosomes were spread and stained with a DNA binding dye. Scale bar, 10 μm (photograph courtesy of Sriramkumar Sundaramoorthy and Mark Petronczki).
Uhlmann BMC Biology 2013 11:9 doi:10.1186/1741-7007-11-9