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.
Entry assays. Viral entry assays were performed with NIH 3T3, NIH 3T3-Hyal-2, and sheep oST cells and retroviral vectors expressing alkaline phosphatase and pseudotyped with the chimeric Envs. Results are denoted <20 when the titer was less than 20 APF/ml.
