Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2003 Apr 14;161(1):89–101. doi: 10.1083/jcb.200212053

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2003, The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

PMC Copyright notice

Figure 6. — The degree and characteristics of speract-induced increases in [Ca² ⁺ ]_i are altered by both increasing and decreasing [K ⁺ ]_e. (A) For each sperm head, the ratio increase in [Ca²⁺]_i was determined from the maximum fluorescence intensity after addition of speract to a final concentration of 500 pM (F_max) and the initial fluorescence intensity value (F₀). F_max/F₀ is presented as the average of all sperm heads analyzed (total number of sperm heads at each [K⁺]_e shown in brackets). Error bars represent ± SEM. (B) Typical responses in individual sperm heads at different [K⁺]_e. F/F₀ shown over time after addition of speract to a final concentration of 500 pM (indicated by arrow). Images acquired at 10 frames per second with 100-ms individual frame exposure time. One-tailed t test (comparison to 10 mM data) ***, P < 0.001; *, P < 0.05.