LEGEND:
Magenta and green. These regions reflect the unique patterns of light and dark bands seen on human chromosomes that have been stained to allow viewing through a light microscope.
Red. The centromere, or constricted portion, of each chromosome.
Yellow. Chromosomal regions that vary in staining intensity and are sometimes called heterochromatin (meaning "different color").
Yellow with thin magenta horizontal lines. (e.g., on chromosome 21) denote variable regions, called stalks, that connect a very small chromosome arm (a "satellite") to the chromosome.