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.
Sucrose density gradient analysis of resuspended VP. VP prepared by ultracentrifugation was resuspended and applied to a sucrose gradient (20–65%). After centrifugation, 1-ml fractions were collected. Density was determined by weight and volume measurements. Cytotoxicity was determined by using LB27.4 targets.
