Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
macromere .
Etymologies
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Examples
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The second quartet micromeres (2m) are formed by laeotropic division of the macromeres 1M.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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In general, ectoblast cells form a cap on the surface of the embryo, sitting atop the large yolky macromeres; in early embryos, all of the ectoblast nuclei thus are found within a short focal distance.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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(B) Eight-cell interphase; the first-quartet micromeres (1a-1d) are nestled between neighboring macromeres (1A-1D).
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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Lymnaea stagnalis, as studied by UV laser deletion of macromeres at intervals between third and fourth quartet formation.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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(D) Fifth cleavage: the third-quartet micromeres are formed by dexiotropic division of macromeres; cells of both the first and second micromere quartets divide also dexiotropically, but with a slight delay.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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Crepidula is likewise consistently inherited by the D cell, 3D identity is not specified until the 24-cell stage, as a result of inductive signaling from first-quartet micromeres to one of the 3M macromeres; this inductive mechanism, like the extrinsic specification of 1d, is primitive
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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The ectoderm originates as a roughly hemispherical cap of micromeres that sit atop the macromeres (top row); this cap spreads by epiboly over the four macromeres until its edges converge at the vegetal pole.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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In this species, the secondary axis is determined through an unusual mechanism: whereas in other gastropod taxa the 3D cell is specified inductively among initially equivalent macromeres, the 3D precursor in
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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The four (typically smaller) cells around the animal pole are called micromeres, and their vegetal sisters are called macromeres.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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By normalizing to the common cell cycle length of these early macromeres, tier-specific cell cycles can be reasonably compared between taxa.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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