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.
Ca2+ distribution in the elongated pollen tube within the papilla cell wall. This image was constructed from a series of optical sections taken at 1.0-μm intervals. An increase in [Ca2+]cyt was observed near the penetration site (an arrow) into the papilla cell.
