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.
Principle of the β-lactamase assay for quantifying virus–cell fusion. (A) A diagram of the Förster resonance energy transfer (FRET)-based BlaM assay. (B) Images of cells loaded with the CCF4-AM BlaM substrate (left panel) and loaded cells after inoculation with HXB2 pseudoviruses bearing the BlaM-Vpr chimera (right).
