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.
Tumors assigned into three grades depending on the number of PDCs. Arrowheads indicate poorly differentiated clusters (PDCs). (a) For G1, four clusters are observed; (b) for G2, six clusters are observed regardless of cluster size; and (c) for G3, more than ten clusters are observed under × 20 objective lens (0.950 mm2 field of vision). The scale bar indicates 100 micrometers.
