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.
Black, green, and red full symbols represent, respectively, the receptors which survive or will be added or eliminated in the next time step. Dashed lines indicate the affected zones by endo/exocytosis events.
