Both types prevent sperm from fertilizing an egg cell. (livescience.com)
Researchers studying embryonic stem cells have explored the first fork in the developmental road, getting a new look at what happens when fertilized eggs differentiate to build either an embryo or a placenta. (sciencedaily.com)
The outcome of this noisy annual ritual was a lot — an awful lot — of fertilized eggs attached to plants or afloat in the waters of the marshes. (discovermagazine.com)