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Micromeres

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Micromeres 

the small cells that form by complete unequal cleavage of an ovum. Micromeres differ from the macromeres of the same embryo by their smaller size and yolk content. The micromeres are usually found in the animal hemisphere of the embryo (for example, in frogs), although sometimes they are located in the vegetal hemisphere (in sea urchins).



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At the third division, micromeres and macromeres could be differentiated and egg development progressed to the gastrula with cell cleavage being total, unequal and spiral (stages 6-11) (Fig.
Embryonic development up to the trocophore stage occurs within the egg membrane and corresponds to the typical development described for gastropod molluscs, with elimination of the two polar bodies after fertilization; segmentation is of the spiral type with the formation of micromeres and macromeres.
 
 
 
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