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From Biology-Online Dictionary | Biology-Online Dictionary
An early form of an embryo undergoing developmental processes, such as cleavage. It is marked by the presence of blastocoel and cells made up of around 128 cells.
Blastula contains a fluid-filled blastocoel surrounded by layers of cells that emerge from series of cleavage. The process involved in the formation of blastula is referred to as blastulation.
Word origin: from Greek blastos, bud + Latin -ula