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.
Scanning electron microscopy images of some bone graft substitutes in the negative control group. A, B: Highly porous β-tricalcium phosphate (β-TCP) - (Negative control group); C, D: β-TCP (Negative control group); E, F: Hydroxyapatite (Negative control group); G, H: Calcium sulphate (Negative control group).
