| Blastomeres (1 tracked article) |
| Branchial Region (2 tracked articles) |
| Cleavage Stage, Ovum (1 tracked article) |
| Cloaca (1 tracked article) |
| Embryo, Mammalian (33 tracked articles) |
| Embryo, Nonmammalian (16 tracked articles) |
| Fetus (33 tracked articles) |
| Gastrula (1 tracked article) |
| Germ Layers (4 tracked articles) |
| Gestational Sac (1 tracked article) |
| Limb Buds (1 tracked article) |
| Mesonephros (1 tracked article) |
| Neural Crest (3 tracked articles) |
| Neural Tube (1 tracked article) |
| Ovum (12 tracked articles) |
| Placenta (24 tracked articles) |
| Primitive Streak (1 tracked article) |
| Zygote (4 tracked articles) |