Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
H&E section of HH28 control embryo (a) and ablated embryo (HH18 R IV occluded) (c) with roman numerals marking PAA branches in plane. Note PAA III is out of the plane slice. (b) and (d) show close up of PAA. Asterisks marks occluded embryo. DA – dorsal aorta.
