Cleavage

And, no (sorry J), I'm not talking about female anatomy....

This morning at 01:00, the fertilized embryos started the cycle of cleaving. If they remain healthy, each cell will divide into two more every 12-24 hours until it reaches the blastula stage. Here's what it looks like now:

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In embryology, cleavage is the 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.