]> blastula stage consider adding a preceding stage 'morula stage' as part of cleavage MmusDv:0000007 OpenCyc:Mx4rEetFnKP2EdqAAAACs4vPlg XAO:1000003 RnorDv:0000054 WBls:0000005 EFO:0001282 OGES:000021 HsapDv:0000006 GgalDv:0000091 BilaDO:0000007 ChirDv:0000010 ZFS:0000045 OGES:000016 OGES:000003 BILS:0000108 Wikipedia:Blastula SscrDv:0000089 SsalDv:0000012 OariDv:0000025 uberon UBERON:0000108 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. http://upload.wikimedia.org/wikipedia/commons/c/c6/Blastulation.png blastula stage occurrent embryo stage part embryo stage life cycle stage cleavage stage preceded_by preceded by preceded by part_of part of part of