Relating to or characterized by achromatin; describing nuclear material that doesn't stain deeply and represents actively expressed genetic material.
From 'achromatin' + '-ic' (adjective suffix). Formed in 20th-century cell biology to describe the properties of lightly-staining nuclear components.
Achromatinic regions of your DNA are the parts your cells are actively reading and using—they're like the open books on a librarian's desk versus the closed books on the shelves!
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