Medical Genetics Euchromatin is threadlike, delicate. It is most abundant in active, transcribing cells. Thus the presence of euchromatin is significant because the regions of DNA to be transcribed or duplicated must uncoil before the genetic code can be readMedical Genetics Euchromatin is threadlike, delicate. It is most abundant in active, transcribing cells. Thus, the presence of euchromatin is significant because the regions of DNA to be transcribed or duplicated must uncoil before the genetic code can be read