Heterochromatin

Heterochromatin is a tightly packed form of DNA found in the cell nucleus. It differs from more open regions by being less active in gene expression, meaning fewer genes are turned on there. This dense packing helps organize the genome, protect DNA from damage, and regulate which genes are active. Heterochromatin is typically found around the edges of the nucleus or near specific chromosome regions, playing a crucial role in maintaining genome stability and proper cell function. Its tightly packed structure makes it less accessible for the cellular machinery that reads and transcribes genetic information.