An early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence. [ ]

This is just here as a test because I lose it

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editor note

consider adding a preceding stage 'morula stage' as part of cleavage