In vitro fertilization happens in five steps. Medication to stimulate healthy egg growth in the woman is the first step. Hormones are injected to help her produce more eggs in a month than she ...

Upon fertilization, two highly specialized meiotic germ cells, the sperm and egg, need to be transformed into a totipotent mitotic embryo. Sperm bind to the zona pellucida of the egg by an unknown ...

An icon in the shape of a lightning bolt. Impact Link When a New York City woman gave birth to twins in March, she and her husband were shocked to find that they were neither girls, as they'd expected ...

The finding of the study, which was published in Andrology, provides scientists with a better knowledge on the structure of the sperm cell's acrosome, an organelle found in the head of the sperm and ...

When sperm meets egg, the start of life is not quiet. Under a special microscope, researchers have watched a tiny light show at fertilization. They see a microscopic flash at fertilization, a burst of ...

Could the sperm harpoon the egg to facilitate fertilization? That’s the intriguing possibility raised by the discovery that a protein within the head of the sperm forms spiky filaments, suggesting ...

New approach enables measurements of changes in thousands of proteins in the minutes after frog eggs are fertilized, revealing previously opaque mechanisms such as how the destruction of a small ...