162 
Monitoring Stem Cell Research 
Ampulla of uterine tube 
Si^ct SIS fctiimteg tte or K'gg. 
B s'1 eivtan 
piei'S 
C Mifus aiiC Semsle 
p-;f<iuckt: 
efssraftcruijg &iSf- 
fHht2i 
E Zygote formed 
Figure 4A-E: Steps in the process of fertilization. The sequence of events begins with 
contact between a sperm and a secondary oocyte (a mature egg) in the ampulla of the 
uterine tube, and ends with formation of a zygote. [A-E: Fig. 1-1, page 3, in Moore, 
Essentials of Human Embryology, 1988, with permission from Elsevier.) 
Figure 4F; (see following page) Shows fertilization of syngamy (from 
www.visembryo.com by Mouseworks, Inc.) 
PRE-PUBLICATION VERSION 
