Mature sperm and eggs grown from same stem cellsNature - the world's best science and medicine on your desktopdoi:10.1038/news060619-13Marchant, JoOAI
A transplantation assay demonstrated that the in vitro-expanded GSCs exhibited stem cell activity and potency to produce functional eggs, sperm, and eventually healthy offspring. In vitro expansion of GSCs can aid in rescuing fishes that are on the verge of extinction....
But in the game of reproduction, every male must either play for the numerical advantage by making lots of small sperm, or invest all his potential in a small number of stronger sperm. The best choice depends on several factors, including how far the sperm must swim, and how much energy ...
The meaning of EGG is the hard-shelled reproductive body produced by a bird and especially by the common domestic chicken; also : its contents used as food. How to use egg in a sentence.
The book discusses bodies and health, pregnancy, birth, adoption, babies, and all types of families. It tells the story of the amazing trips taken by the egg and the sperm, showing when and how an egg travels to the uterus and how sperm travel and can meet an egg. Actual-size ...
Parental Care of Eggs 13 13 Please note that many pairs will not incubate their eggs unless at least three eggs are present in their nest. 13 Species foster parents Performing Nest Checks Candling Eggs on or after the fifth day of incubation ...
No men OR women needed: artificial sperm and eggs created for first time By Fiona Macraegone
摘要: Rene Almeling examines the medical market for eggs and sperm in the United States - how it is organized and how it influences and is experienced by donors.关键词:eggs sperm in vitro fertilization commodification egg donor sperm donor ...
Some cells are set up to become stem cells, which will then have the potential to develop into any type of cell in the body. And some cells in the fetus become primordial germ cells and eventually evolve into the cells of either sperm or eggs, which will allow this offspring to pass th...
It is possible that eggs are more attracted to genetically compatible sperm, which may increase the chance that they are fertilised, says Fitzpatrick. The chemical interactions between eggs and sperm after sex may also play a role in why some people have difficulty conceiving. In around ...