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.
Examples of a sentinel lymph node and, in the centre of the image, a 4-mm metastasis of a Gleason 8 prostate cancer after haematoxylin and eosin (H&E) (a and c) and Perl’s Prussian blue (b and d) staining showing the brown and blue discolouration of the absorbed iron oxide nanoparticles in the surrounding lymphatic tissue
