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.
Each data point represents the mean result ± standard deviation (error bars). Open circles (○): control; filled squares (■): 0.12 μg/ml; open squares (□): 0.5 μg/ml; filled triangles (▲): 2 μg/ml.
