macromere


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macromere

[′mak·rō‚mir]
(embryology)
Any of the large blastomeres composing the vegetative hemisphere of telolecithal morulas and blastulas.
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Because of the crucial significance of macromere 3D and mesentoblast 4d for the specification of the developmental fate of the embryonic cells, it may be assumed that heterochronic changes in 3D induction may have far reaching morphogenetic consequences.
Cleavage patterns and mesentoblast formation in the Gastropoda: an evolutionary perspective
The 3D macromere serves as the organizer, and its removal at successively later stages during this time interval leads to fewer developmental defects.
The slipper snail, Crepidula: an Emerging lophotrochozoan model system[dagger]
During cleavage, gastropod Hb-like expression is uniform and labels both micromere and macromere nuclei (Fig.
Hunchback-like protein is expressed in cleavage blastomeres, gastrula epithelium, and ciliary structures in gastropods
For example, patellogastropods (true limpets) and euthyneuran gastropods (pulmonates and opisthobranchs) with equally cleaving eggs depend on regional segregation of morphogenetic determinants to specify the animal-vegetal axis (4), but an inductive interaction between micromeres and one of the macromeres later specifies the dorsoventral axis of the embryo (5, 6).
Novel embryogenesis in a nudibranch gastropod: segregation, expulsion, and abandonment of deeply pigmented egg cytoplasm
With third cleavage, MAPK was found exclusively within the two posterior midline macromeres. In living squid embryos, these cells undergo a delayed cleavage in comparison to the rest of the cells within the embryo.
MAP kinase expression correlates with the posterior midline in early cleavage stage squid embryos
Development of Ilyanassa following removal of the D macromere at successive cleavage stages.
Persistent ancestral feeding structures in nonfeeding annelid larvae
Bravo-Hollis y Sanchez-Mejorada (1991) erigieron la serie Macromeres para ubicar a Coryphantha macromeris.
Variacion morfologica de coryphantha (Cactaceae): un enfoque multivariado
In S2, there was a differentiation of vegetative (macromeres) and animal (micromeres) poles, while the embryo was 49.5 [+ or -] 4.7 mm in diameter.
Reproductive cycle and embryonic development of the gastropod Melampus coffeus (Linnaeus, 1758) (Ellobiidae) in the Brazilian Northeast/ Ciclo reprodutivo e desenvolvimento embrionario do gastropode Melampus coffeus (Linnaeus, 1758) (Ellobiidae) no Nordeste do Brasil
Gray Phyllodictyon anastomosans (Harvey) Kraft & Wynne (1; C; L) Phyllodictyon pulcherrimum Gray (C; NE) Familia Siphonocladaceae Chamaedoris Montagne, 1842 Chamaedoris peniculum (Ellis & Solander) Kuntze (S y C; L y A) Cladophoropsis B0rgesen 1905 Cladophoropsis macromeres W.
Inventario de la flora marina del Archipielago Sabana-Camaguey, Cuba
Similar to the current study, dominant species reported included Sargassum polycarpum, Turbinaria tricostata, and Cladophoropsis macromeres.
Characterization of a high energy macroalgal community in Quintana Roo, Mexico using digital image analysis
At this stage, the blastomeres divided unequally, creating cells of various sizes, including macromeres and micromeres (Fig.
EMBRYONIC, LARVAL, AND EARLY POSTLARVAL DEVELOPMENT OF THE TROPICAL BLACK-LIP ROCK OYSTER SACCOSTREA ECHINATA
The first two cleavages were equal and the third unequal, producing four micromeres and four macromeres at the animal and vegetal poles, respectively (Fig.
Complete development of the northeast Pacific arminacean nudibranch Janolus fuscus

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