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(cell and molecular biology)
The portion of the chromosomes that stains with low intensity, uncoils during interphase, and condenses during cell division.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also active chromatin), the portion of the chromatin that retains the uncoiled form of elementary deoxyribonucleoprotein (DNP) threads in the interval between cell divisions (that is, in the interphase), as opposed to the portion of the chromatin known as heterochromatin, which retains the coiled form. Euchromatin also differs from heterochromatin in that it participates in the intensive synthesis of ribonucleic acid (RNA) and contains a larger quantity of nonhistone proteins. Euchromatin contains not only DNP but also ribonucleoprotein granules, which have a diameter of 200–500 angstroms and serve to complete the maturation of the RNA and its transfer into the cytoplasm. Euchromatin contains most of the structural genes of an organism (seeCHROMOSOME).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Krig et al., "N-Myc regulates a widespread euchromatic program in the human genome partially independent of its role as a classical transcription factor," Cancer Research, vol.
plana neuronal somata, histology, and ultrastructure revealed neurons with one euchromatic round-to-oval nucleus with one salient nucleolus, and cytoplasm with the usual key organelles, standing out mitochondria; overall in line with the other bivalve species (Bullock & Horridge 1965, Odiete 1978, Stefano 1990, Morse & Zardus 1997).
The tramadol withdrawal for 1 week showed some enhancement as the adrenal cortex in group III showed ZG cells with euchromatic nuclei of irregular outlines and peripheral clumps of heterochromatin, an apparent increase in lipid droplets, and mitochondria with intact cristae more or less as the control.
The C[Cl.sub.4]-treated group illustrated the entire damage of hepatocytes, destruction of normal euchromatic nucleus, degeneration of central vein, fat accumulation, and foam cell formation.
Rauscher 3rd, "SETDB1: a novel KAP-1-associated histone H3, lysine 9-specific methyltransferase that contributes to HP1-mediated silencing of euchromatic genes by KRAB zinc-finger proteins," Genes & Development, vol.
Non-telomeric sites as evidence of chromosomal rearrangement and repetitive (TTAGGG) arrays in heterochromatic and euchromatic regions in four species of Akodon (Rodentia, Muridae).
Although ATM is typically a central regulator of cellular responses to DNA double-strand breaks, it is dispensable for repair of euchromatic breaks (Goodarzi et al.
The tomato genome sequence, published a year later than the potato sequence, confirmed remarkable synteny with the potato genome (8.7 % sequence divergence between homologous euchromatic regions) with nine large and several smaller inversions (The Tomato Genome Consortium, 2012), providing evolutionary data relating to these two sister clades.
Control rats showed normal epithelial cells with regularly arranged columnar cells and large rounded euchromatic nuclei.
In these sections for each of these nuclei, the neurons, identified by the euchromatic nucleus having one or two nucleoli and Nissl substance in the cell body, were drawn on a translucent paper with the help of a camera lucida drawing tube using a 100x objective.
This species has been preferred as a model organism for legume biology because it has a small diploid (2n = 16) genome (500-550 Mbp total and200-250 Mbp to be sequenced in gene-rich euchromatic regions), is self-fertile, has a rapid generation time and prolific seed production, and is amenable to genetictransformation (Erayman et al., 2014; Young et al., 2005;Barker et al., 1990; Chabaud et al., 2003; AraAjo et al.,2004; Crane et al., 2006).However, there are not adequate number of microsatellites available for Onobrychis.