Chromatin Fiber

**Semantic type:** Cell Component

**Definition:** A level of DNA packaging in chromatin above that of the nucleosome, the fundamental subunit of chromatin structure. The chromatin fiber has a thickness of about 30 nanometers and results from the folding of a linear array of nucleosomes (thickness about 10 nm) into a more compact fiber.

**Synonyms:** - 30 nm Chromatin Fiber - 30 nm Fiber - Chromatin Fibril