For the first time, a stem cell model has produced a structure resembling an early human embryo with a yolk-sac-like structure, from a single starting stem cell population and without direct genetic ...

By examining genetic clues that linger in adult cells, scientists have now gained surprising insights into the developmental ...

The human immunodeficiency virus (HIV), which is the cause of AIDS, is a master of deception, using just nine genes to hijack ...

Every pregnancy depends on an organ that most people will never see. As organs go, the placenta — the tissue that surrounds a developing fetus — is a jack of all trades. It can filter toxins like a ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. Electrically stimulating key cells in the immune system could "reprogram" them to reduce inflammation and encourage ...

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Every day the human body replaces billions of cells, flushing out the old and generating the new, healthy ones. The average lifespan of a red blood cell is just under four months, while skin cells ...

Scientists may have discovered another way the human body tries to protect itself from cancer. New research on mice suggests ...