Blastomeres


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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.

References in periodicals archive ?
tribuloides (Wray and McClay, 1988), blastomeres were size-fractionated using a sucrose gradient, then micromeres from donor embryos were combined with host blastomeres to form chimeras.
On the other hand, blastocyst stage embryo has also the advantage of possessing many cells, thus the loss of few blastomeres during the freezing and thawing processes might not compromise the integrity of the entire specimen.
The researchers obtained forty-eight blastomeres from the seventeen polyspermic embryos (eight two-cell, two three-cell, five four-cell, and two eight-cell), or theoretically forty-eight new totipotent embryos.
fomicata, the polar lobe and individual blastomeres may be isolated to study subsequent development and to assay for developmental potential and the presence of specific cell-cell inductive interactions (see section F1 in Henry et al.
For the second cleavage, the PL extruded from the large blastomere (data not shown).
The means of fixation of the mutual positions among the blastomeres of sea urchin larvae.
Transfer of mtDNA even in the form of blastomere nuclei (the technique which has been scrutinised the most by ethicists) is not 'reproductive cloning of a human being'.
To construct the parental haplotype, we performed All-in-One target sequencing using genomic DNA extracted from the peripheral blood of parents (PED-Mother & PED-Father) and the proband daughter (PED-Sister) as well as WGA products from the 7 blastomeres, including the transferred embryo (PED-E-B) and the other 6 embryos nontransferred (PED-E-1,2,4,5,6,7).
Epidermal cells are differentiated, even if blastomeres are continuously dissociated to prevent cell--cell interactions until the early gastrula stage.
Fluorescence in situ hybridization analysis of two blastomeres from day 3 frozen-thawed embryos followed by analysis of the remaining embryo on day 5.
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).