Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A large blastomere.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large blastomere.

from The Century Dictionary and Cyclopedia

  • n. In embryology, the larger one of two unequal masses into which the vitellus of a lamellibranch, as a fresh-water mussel, divides; the so-called vegetative cell of Rabl, which subdivides into blastomeres, partly by fission, partly by gemmation. See micromere.
  • n. In embryology:
  • n. One of the large yolk-laden cells, found about one pole of an egg in case of unequal segmentation, such as occurs in the hagfish, Myxine: contrasted with micromere.

Etymologies

macro- + (blasto)mere.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • The D quadrant founder cell and 1D macromere are shaded pink-gray.

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  • Ilyanassa involves inherited factors and position with respect to the inducing D macromere.

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  • Supporting this notion, selection of one macromere as 3D in the pulmonate

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  • The second quartet cells divide at the same time as their macromere sisters, in the transition from the 16-cell to the 24-cell stage.

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  • Furthermore, both the Delta-dependent secondary mesoderm-GRN and the late endoderm-GRN (17 to 30 h p.f.) that is subsequently activated in veg2 and veg1 macromere progeny are independent of ActivinB function.

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  • The micromere determinant Pmar1 activates the PMC-GRN and transmits endomesoderm-inducing signals to macromere descendants.

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  • Second, SoxB1 clearance is not required for activation of the early EM-GRN because macromere progeny express early Pmar1-responsive core factors in this subnetwork before SoxB1 protein levels are detectably reduced in nuclei of the same cells.

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  • Thus, the primary cellular targets of ActivinB signaling during pregastrular endomesoderm development are the more vegetal (veg2) macromere derivatives.

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  • During the period when this axis is inductively patterned by the 3D macromere and / or its daughter 4d, the 1m

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  • The chirality of the oblique macromere divisions alternates with each cell cycle: e.g., the first quartet is budded to the northwest, the second to the northeast, and the third to the northwest once more.

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