part of part of simultaneous with immediately preceded by embryonic cleavage embryo stage life cycle stage zygote stage cleavage stage BILS:0000107 ZFS:0000046 FBdv:00000054 XAO:1000004 OGES:000020 MESH:D002970 EFO:0001290 OGES:000015 PdumDv:0000200 BilaDO:0000006 UBERON:0000107 The first few specialized divisions of an activated animal egg; Stage consisting of division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called the morula. Cleavage ends with the formation of the blastula. Wikipedia:Cleavage_(embryo)