Embryo of the American Alligator Alligator mississippiensis at 33 days of development (approximately 50% of the entire embryonic period). All of the external structures, including characteristic jaws and limbs, are already in place and clearly visible. 

Asymmetric cell division in a live zebrafish embryo.

Tableaux interrogatifs, ou Nouvelle méthode d'enseigner l'art des accouchemens [sic] aux sages-femmes de la campagne. 8e. tableau, Du foetus et de ses dépendences / École départementale de l'Ain.

3D MRI of a 6-day-old quail egg

3D MRI of a six-day-old quail embryo alive inside its egg.

3D MRI of a six-day-old quail embryo alive inside its egg

Sections of developing mouse embryo

Developing mouse head

Movie: 16 dpc mouse heart

Mouse heart showing position of coronary arteries

Habenular nucleus of zebrafish, composition

Dorsal view of the forebrain of a wild-type zebrafish embryo

Mouse embryonic posterior neuropore, confocal image.

Situs inversus, illustration

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