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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.



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Removal of Lysed Blastomeres from Frozen-Thawed Cleavage Stage Embryos Improves Implantation and Pregnancy Rates in Frozen Embryo Transfer Cycles," (2005) 84 Fertility and Sterility 1606.
First cleavage (Stage II) occurs 25-32 min after fertilization, forming two blastomeres, each with a diameter of 90 [micro]m (II-B).
Many scientists believe that blastomeres derived from human zygotes could be used to generate cell lineages for research that might provide new weapons against debilitating diseases.
 
 
 
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