Euchromatin

Euchromatin is a lightly packed form of chromatin (DNA, RNA and protein) that is rich in gene concentration, and is often (but not always) under active transcription. Unlike heterochromatin, it is found in both cells with nuclei (eukaryotes) and cells without nuclei (prokaryotes). Euchromatin comprises the most active portion of the genome within the cell nucleus. 92% of the human genome is euchromatic.