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.
Cell membrane penetration. Representative plots of the tip movement toward the glass substrate when the tip was above the periphery (a) or the nucleus (b) of an untreated cell. Zoom-ins show two and six penetration events, respectively. To see this figure in color, go online.
