chromatin(redirected from Chromatin structure)
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Related to Chromatin structure: nucleosome
the substance of the chromosomes, composed of DNA and basic proteins (histones), the material in the nucleus that stains with basic dyes.
sex chromatin the persistent mass of the material of the inactivated X chromosome in cells of normal females; called also Barr body.
The genetic material of the nucleus consisting of deoxyribonucleoprotein that occurs in two forms during the phase between mitotic divisions: as heterochromatin, seen as condensed, readily stainable clumps; as euchromatin, dispersed lightly staining or nonstaining material. During mitotic division the chromatin condenses into chromosomes.
[G. chrōma, color]
chromatin/chro·ma·tin/ (kro´mah-tin) the substance of chromosomes, the portion of the cell nucleus that stains with basic dyes. See euchromatin and heterochromatin.
sex chromatin Barr body; the persistent mass of the inactivated X chromosome in cells of normal females.
A complex of nucleic acids and proteins, primarily histones, in the cell nucleus that stains readily with basic dyes and condenses to form chromosomes during cell division.
Etymology: Gk, chroma, color
the material within a cell nucleus from which the chromosomes are formed. It consists of fine, threadlike strands of DNA attached to proteins called histones and is readily stained with basic dyes. Chromatin occurs in two forms, euchromatin and heterochromatin, which are distinguishable during the phases of the cell cycle by their different degrees of staining, which in turn depends how tightly they are coiled. During cell division, portions of the chromatin condense and coil to form the chromosomes. Also called chromoplasm, karyotin. See also chromatid, euchromatin, heterochromatin, sex chromatin. chromatinic, adj.
chromatinThe threadlike stainable material seen in nuclei during interphase, which corresponds to chromosomes (nucleic acids/DNA, associated histones, and other proteins bundled into nucleosomes) in the eukaryotic nucleus.
chromatinGenetics The stainable material of interphase nuclei corresponding to chromosomes; chromatin consists of nucleic acids–DNA and associated histone protein, which are packed into nucleosomes; euchromatin is loosely packed and accessible to RNA polymerases. See Salt & pepper chromatin. Cf Heterochromatin.
The genetic material of the nucleus, consisting of deoxyribonucleoprotein. During mitotic division, the chromatin condenses into chromosomes.
[G. chrōma, color]
chromatinDNA. The elongated, fine-stranded complex of roughly equal quantities of DNA and the protein histone, from which chromosomes are made by condensing into a coil. The individual chromosomes cannot be distinguished in a chromatin strand.
chromatinthat part of the cell nucleus which becomes deeply stained with basic dyes. This is now known to be chromosomal material consisting of DNA together with HISTONE and nonhistone proteins.
chromatinnuclear genetic material, which condenses (during cell division) into chromosomes
The genetic ma terial of the nucleus, consisting of deoxy ribonucleoprotein. During mitotic division, the chromatin condenses into chromosomes.
[G. chrōma, color]
n the genetic material present in the nucleus, consisting of DNA and associated proteins, seen as irregular clumps in quiescent cells.
the substance of the chromosomes, composed of nucleic acids and basic proteins (histones), the material in the nucleus that stains with basic dyes.
Barr body; the persistent mass of the material of the inactivated X chromosome in cells of normal females. See also drumstick.