Fig. 4

Puppy #2. Cross-section through the ascending and descending aorta at the level where the aortic arch should be present - asterisk indicates absence of the transverse aortic arch. DAo descending aorta, AAo ascending aorta.

Puppy #2. Cross-section through the ascending and descending aorta at the level where the aortic arch should be present - asterisk indicates absence of the transverse aortic arch. DAo descending aorta, AAo ascending aorta.