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.
Illustration of three assays used in affinity-based single-molecule sensors. In a direct assay, the signal is generated by the analyte itself. In a sandwich assay, a tag or detection probe is used to provide a signal once an analyte is bound. In a competitive assay, a labeled competitor is detected whose interaction with the receptors is prevented in the presence of an analyte.
