Sea Urchin Embryology Back to Contents page

 

 

 

[ANIMATIONS][PATH]

NOS REACTION

The cytoplasm of the sperm contains NOS (Nitric Oxide Synthase) which is activated along with the acrosome reaction by contact with egg jelly [yellow] [NOS turns green here when activated]. Activated NOS produces Nitric Oxide [light green spray].

Upon fusion with the egg, NOS is released into the egg, whereby the NO produced activates Calcium release [red spray]. Calcium activates NOS already present in the egg, releasing more NO, which releases more Calcium, etc. Starting a wave of calcium throughout the egg.

Windows: Right click on animation and choose save to file

Macintosh: Hold click on animation and choose save to file

© 2000 Chris Patton, Stanford University

See also ACROSOME REACTION