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.
Pronuclear formation after ICSI. The presence of pronuclei (PN) was analyzed 14–16 h post sperm injection. a Activated oocytes showed two clearly distinguishable pronuclei; b non-activated oocytes showed chromosomal metaphase (MII) and a non-decondensed sperm head (SPZ head) closer to it. All nuclei were counterstained with propidium iodide. Scale bar = 10 μm
