organizer region

organizer region

an area in the animal embryo that appears to control the differentiation of cells in that region. For example, the dorsal lip of the blastopore (see BLASTULA plays a major part in determining the shape of the early embryo.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
An improved technique for selective silver staining of nucleolar organizer region in human chromosomes.
10 Eslami B,yaghmaei M,firoozi M,Nucleolar organizer region in selected odontogenic lesions.
The objectives of this study were to compare the argyrophilic nucleolar organizer region (AgNOR) parameters and estrogen receptor status with grades of invasive ductal carcinoma of breast.
Their topics include the evolutionary role of hybridization and polyploidy in an Iberian cyprinid fish, chromosomal analysis in population structuring and stock identification, nucleolar organizer region markers in identifying and managing rainbow trout stocks reared in Brazil, and applying fluorescence in situ hybridization to genome mapping in fish.
Chromosomes with satellites also had a C-band at the nucleoulus organizer region site on the chromosome and a C-band adjacent to the satellite.
Abbreviations: CI, centromeric index; FISH, fluorescence in situ hybridization; NOR, nucleolar organizer region.
Studies in our laboratory over the past several years have focused on identifying the nucleolar organizer region (NOR)-bearing chromosomes of North American cyprinid fishes (Amemiya and Gold, 1988, 1990; Amemiya et al., 1992).
Giemsa staining, nucleolar organizer region (NOR) banding, C-positive heterochromatin banding and DAPI fluorescence were used in N metaphases of a specimen collected in Asa Branca Farm, in Aurora do Tocantins municipality, Tocantins state, Brazil.

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