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.
A high-magnification photomicrograph of a graft site of the membrane-cover group, showing many newly formed vessels (V) within the residual collagen membrane (white asterisk). Black asterisk: periosteum-like dense connective tissue layer (Masson's trichrome stain, scale bar=500 µm).
