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.
Transmission electron microscope image of the ultrastructure of thin sections of cerebrum samples of a 20-day-old chicken embryo from the control group. (A) Mitochondrion (m), nuclei of nerve cells (N), nuclei of oligodendroglia (O). (B) Nuclei of astrocytes (A), mitochondrion (m).
