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blastula
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The answer BLASTULA has 1 possible clue(s) in existing crosswords.
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Definitions of blastula in various dictionaries:
noun - early stage of an embryo produced by cleavage of an ovum
An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity.
noun - an early embryo
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Embryonic stage |
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Mar 20 2004 New York Times |
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An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Also called blastosphere. |
early stage of an embryo produced by cleavage of an ovum a liquid-filled sphere whose wall is composed of a single layer of cells during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs |
An animal embryo at the early stage of development when it is a hollow ball of cells. |
Blastula description |
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The blastula (from Greek (blastos), meaning "sprout") is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoele formed during an early stage of embryonic development in animals. Embryo development begins with a sperm fertilizing an egg to become a zygote which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoele is formed does the early embryo become a blastula. The blastula precedes the formation of the gastrula in which the germ layers of the embryo form.A common feature of a vertebrate blastula is that it consists of a layer of blastomeres, known as the blastoderm, which surrounds the blastocoele. In mammals the blastula is referred to as a blastocyst. The blastocyst contains an embryoblast (or inner cell mass) that will eventually give rise to the definitive structures of the fetus, and the trophoblast, which goes on to form the extra-embryonic tissues.During the blastula |