Chromatogen organ see axial gland

chromatography n. [Gr. chroma, color; graphien, to draw] An analytical method of chemical analysis based on the selective absorption of inorganic or organic compounds through a porous medium.

chromatoid body A body containing ribonucleoprotein material found near the nucleus during certain stages of sper-matogenesis.

chromatoid grains In cell protoplasm, granules that stain similarly to chromatin.

chromatolysis n. [Gr. chroma, color; lysein, to loosen] The solution and breaking up of chromatin. chromatolytic a.

chromatophore n. [Gr. chroma, color; phoreus, bearer] A single highly branched cell or synctia containing pigment granules that may disperse in the branches or concentrate in the center and effect color changes in various invertebrates.

chromatotropism n. [Gr. chroma, color; trope, turn] A taxis in response to stimulation by a particular color.

chromidium n.; pl. -midia [Gr. dim. chroma, color] Any of the basophilic fibrils in the cytoplasm that are composed of RNA-containing parts and RNA-free parts.

chromioles n.pl. [Gr. dim. chroma, color] The minute granules of which a chromomere is composed.

chromoblast n. [Gr. chroma, color; blastos, bud] An embryonic cell that develops into a pigment cell.

chromocenter n. [Gr. chroma, color; kentron, center] A granule of heterochromatin, whose numbers vary in the interphase nuclei.

chromocytes n. [Gr. chroma, color; kytos, container] 1. Pigmented cells. 2. (porif) Pigmented amoebocytes contained in the mesogloea.

chromogen n. [Gr. chroma, color; genos, birth] A colorless substance that is the precursor of a pigment.

chromogenesis n. [Gr. chroma, color; genesis, beginning] Color production.

chromolipids n.pl. [Gr. chroma, color; lipos, fat] The carote-noids and related pigments.

chromomere n. [Gr. chroma, color; meros, part] one of the bead-like concentrations of chromatin found along the length of a chromosome.

chromonema n.; pl. -nemata [Gr. chroma, color; nema, thread] The smallest light microscopic strand in chromosomes and chromatids.

chromophile n. [Gr. chroma, color; philos, loving] 1. Chromaffin. 2. (ARTHRO: Insecta) A blood cell, intermediate or transitional between prohemocytes, plasmatocytes and possibly other types of blood cells.

chromophilic, chromaphilic a. [Gr. chroma, color; philos, loving] Staining readily, as certain cells. see chromophobe cells.

chromophobe cells Cells that do not absorb stains readily. see chromophilic.

chromophore n. [Gr. chroma, color; phorein, to bear] A group of atoms to whose presence definite color in a compound are attributed, and when combined with certain salt-forming groups (auxochromes) produce dyes.

chromoprotein n. [Gr. chroma, color; proteios, primary] A compound protein that contains a pigment, as in hemoglobin of higher animals and hemocyanin of lower animals.

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