A complex of DNA and basic proteins
(such as histone) in eukaryotic cells
that is condensed into chromosomes in mitosis
and meiosis. There are two types. Heterochromatic
is densely-coiled chromatin that appears as nodules in or along chromosomes
and contains relatively few genes. Euchromatic is the less-coiled
and genetically active portion of chromatin that is largely composed of
| Credit: Felsenfeld and Groudine.