The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Blastomeres

cells formed in the process of cleavage of the ovum in multicellular animals. Absence of growth is characteristic of blastomeres, in consequence of which they are diminished by half with each succeeding division (until the formation of the blastula). In the cleavage of holoblastic ova, large blastomeres (macromeres) and small blastomeres (micromeres) are formed with unequal distribution of nutritive substances.

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References in periodicals archive

In most caridean shrimps, including Crangon crangon, Caridina laevis, Paratya compressa, and Synalpheus minus, radial cleavage is maintained only until the third cell division, when blastomeres rearrange, as shown in Figure 2 (Ishikawa, 1885; Weldon, 1887; Brooks and Herrick, 1891; Nair, 1949).

Embryonic Development in the Peppermint Shrimp, Lysmata boggessi (Caridea: Lysmatidae)

Division of the blastomere (BL), which is evidence of the fertilization of the oocyte after surgical extraction of follicles from a chicken.

Surgical Extraction of Viable Hen (Galius gallus domesticus) Follicles for In Vitro Fertilization

For the second cleavage, the PL extruded from the large blastomere (data not shown).

MEIOTIC AND EARLY ZYGOTIC DEVELOPMENT IN CRASSOSTREA VIRGINICA OBSERVED THROUGH CONFOCAL MICROSCOPY

Blastomere morphology as a predictive measure of fish egg viabilility.

Embryonic and larval development of Brycon amazonicus (Spix & Agassiz, 1829)/Desenvolvimento embrionario e larval de Brycon amazonicus (Spix & Agassiz, 1829)

Aneuploidies of the blastomeres were analyzed according to the depth of the heterozygous SNP alleles.

Embryo genome profiling by single-cell sequencing for preimplantation genetic diagnosis in a [beta]-thalassemia family

Soxbl is expressed in the animal hemisphere and the vegetal-anterior blastomeres; Gata.a might activate the expression of Soxb1 in the animal hemisphere, and combinatorial activity of [beta]-catenin and Macho-1/ Zic-r.a might repress the expression of Soxb1 in the vegetal-posterior blastomeres, although this possibility has not yet been experimentally tested.

Gene regulatory systems that control gene expression in the Ciona embryo

In fact, the Oct-4 is a protein of Pit-Oct-Unc family (5) which is characterized by exclusive expression in blastomeres, in the inner cell mass of the blastocyst, and in the germ cell lineage (6), (7).

Constructing a mouse Oct4 promoter/EGFP vector, as a whole-cellular reporter to monitor the pluripotent state of cells

Embryo evaluation criteria, A-grade: Embryos with even granulation and well-defined distinct outline, B grade: Embryo with intact but hazy outline having extruded cells and some degenerate blastomere, Degenerated: Embryos with degenerated blastomeres and not possible to determine the exact developmental stage,

SUPEROVULATORY RESPONSE IN SUMMER ANESTRUS BUFFALOES AND CATTLE TREATED WITH ESTRUS SYNCHRONIZATION PROTOCOL