This computer rendering shows the skeletonized structure of heterochromatin (red represents a thin region while white represents a thick region), a tightly packed form of DNA, surrounding another form of DNA - carrying material known
as euchromatin (dark blue represents a thin region and yellow represent the thickest) in a mouse's mature nerve cell.
It has three key protein domains: a DNA - binding domain, a chromodomain (which may bind
euchromatin), and a helicase domain (which is thought to activate transcription by acting against repressing transcription effects, such
as heterochromatin structure).