Immunohistochemical staining for HOXA4 in human aorta. A, Representative images of intima, media, and adventitia of young and aged aortic tissue. Arrows indicate nuclear staining (black arrows) and punctuate, aggregate-like staining (white arrows). B, Enlarged frames of the boxed regions in A. Scale bar = 50 μm.
Lillvis et al. BMC Physiology 2011 11:9 doi:10.1186/1472-6793-11-9