part of part of immediately_preceded_by immediately preceded by embryo stage part embryo stage zygote stage cleavage stage BILS:0000107 BilaDO:0000006 EFO:0001290 FBdv:00000054 MESH:A16.254.270 MmusDv:0000004 OGES:000015 OGES:000020 PdumDv:0000200 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. UBERON:0000107 XAO:1000004 ZFS:0000046 uberon