The portion of a cell nucleus that does not stain deeply with dyes, contrasting with chromatin; also called euchromatin, it represents genetically active DNA.
From 'achrom-' (colorless) + '-in' (chemical suffix). Named in cell biology when researchers observed that not all nuclear material stained equally under microscopes.
Achromatin is the 'active' DNA that your genes are actually using right now—the stuff that looks colorless under a microscope because it's too busy being read by your cells to sit around being dramatic!
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