How egg cells choose their best powerhouses to pass on

Developing egg cells conduct tests to select the healthiest of their energy-making machines to be passed to the next generation. A new study in fruit flies, published online May 15 in Nature, shows how the testing is done.

Revealing the biology of insulin production

The discovery of insulin has saved the lives of millions of people with diabetes worldwide, but little is known about the first step of insulin synthesis.

Putting stem cells on pause

People are having children later than ever before. The average age of new parents in the United States has been rising for at least the past half century.

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