Chromatin
Definition
Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. It condenses to form chromosomes during cell division and decondenses for gene expression.
Analogy
Consider chromatin like yarn stored in a basket (the nucleus). When it's time to knit (cell division), the yarn is wound tightly into balls (chromosomes) for easier use.
Related terms
Histones: These are proteins that help package DNA into a compact, efficient form by serving as spools around which DNA winds.
Nucleosome: The basic unit of DNA packaging in eukaryotes, consisting of a segment of DNA wound around eight histone proteins.
Euchromatin: A lightly packed form of chromatin that is enriched in genes and is often under active transcription.
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