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.
Morphological features of a bovine embryo at day 23 of gestation. Embryos were harvested at 23 d of gestation and examined for developmental milestones. Gross morphology of the embryo (A) demonstrating the presence of branchial arches (BA, i), a beating four-chamber heart (H, ii), and the presumptive forelimb bud (PL, iii). Bar represents 1 mm.
