10. 
    blastula
    hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the ... [5 related articles]
    Found op http://www.britannica.com/eb/a-z/b/77
    
    
11. 
    Blastula
    The blastula (from Greek βλαστός (blastos), meaning "sprout") is a hollow sphere of cells formed during an early stage of embryonic development in animals . The blastula is created when the zygote undergoes the cell division process known as cleavage. The blastula is preceded by the morula a...
    Found op http://en.wikipedia.org/wiki/Blastula
    
    
12. 
    blastula
    A late blastula characterized by a single layer of cells surrounding the central hollow area – the blastocoel (B). The blastomeres at the vegetal pole (VP) are taller than those at the animal pole (AP), making the vegetal pole appear slightly thicker. Photo: University of Guelph A stage o...
    Found op http://www.daviddarling.info/encyclopedia/B/blastula.html
    
    
13. 
    Blastula
    An early stage of embryonic development in which the fertilized egg transforms from a solid mass of cells to a hollow ball of cells. The blastula consists of a spherical structure formed by a single layer of cells that encloses a fluid-filled cavity.
    Found op http://www.pregnology.com/AZ/B/4
    
    
14. 
    blastula
    Early stage in the development of a fertilized egg, when the egg changes from a solid mass of cells (the morula) to a hollow ball of cells (the blastula), containing a fluid-filled cavity (the blastocoel). See also embryology
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0007957.html
    
    
15. 
    blastula
    (blas;tyoo-lua) An early stage of prenatal development between the morula and embryonic period.
    Found op http://www.mhhe.com/biosci/abio/glossary.mhtml
    
    
16. 
    blastula
    (blas;tyoo-lua) An early stage of prenatal development between the morula and embryonic period.
    Found op http://www.mhhe.com/biosci/abio/glossary.mhtml
    
    
17. 
    blastula
    1) Blastodermic vesicle 2) Conceptus 3) Early stage of an embryo produced by cleavage of an ovum 4) Embryo 5) Embryonic stage 6) Fertilized egg
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/blastula/1
    
    

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