There are many potential causes of infertility, and it can be challenging to pin down just what the problem is when a couple ...

Researchers showed how what appears to be a tangle of DNA is actually organized into a structure that coordinates thousands of genes to form a sperm cell. The work, published as two papers in Nature ...

Almost every type of human cell is powered by mitochondria, bean-shaped organelles that use oxygen to synthesize usable energy.* These structures evolved billions of years ago from free-swimming ...

In which we meet the pioneers of one of the most exciting — and controversial — fields of biomedical research: in vitro gametogenesis, or IVG. The goal of IVG is to make unlimited supplies of what ...

In Brazil, researchers at São Paulo State University (UNESP) conducted experiments on rats and identified that a protein-deficient diet during pregnancy and breastfeeding can compromise the ...

In a scientific breakthrough that raises a number of medical and ethical issues, researchers have used stem cells to create living, growing models of a human embryo. Because stem cells were used, ...

REHOVOT, Israel, Sept 7 (Reuters) - Scientists in Israel have created a model of a human embryo from stem cells in the laboratory, without using sperm, eggs or a womb, offering a unique glimpse into ...

Since 1687, Sir Isaac Newton’s three laws of motion, as published in his work “Mathematical Principles of Natural Philosophy,” have guided our understanding of the relationships between physical ...