Embryo Chart.

Embryo Chart.
Bovine embryos at different stages of development at 350 X. A) Day 3, 4-cell embryo; B) Day 5, 16-cell embryo; C) Day 6, Morula; D) Day 7, Early blastocyst; E) Day 10, Expanded blastocyst; F) Day 10, Hatching blastocyst.

Betteridge KJ (1977)