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 the U.S., around 645,000 men between the ages of 20 and 50 are diagnosed with azoospermia—the medical term for the absence of sperm in the semen.

Previously, there were no cell types from the fly uterus identified with genetic markers. The new study reveals more than 20 different cell types in the uterus and associated organs. “The most ...

Human sperm can swim through surprisingly viscous fluids with ... Scanning electron micrograph of a sperm cell in a fallopian tube. (Science Photo Library/Canva) However, nature is chaotic, and not ...

Oh, brave new world, that has such embryos in it. In a dramatic scientific first, researchers have created synthetic human embryos without using sperm or an egg. No one knows if these embryonic ...

Living human embryo model conceived without sperm or egg: breakthrough study By . Marc Lallanilla. Published Sep ... Human stem cells have the ability to develop into any other type of human cell.

Scientists have 3D printed human testicular cells and identified promising early signs of sperm-producing capabilities. The researchers hope the technique will one day offer a solution for people ...

The day when human sperm and eggs can be grown in the laboratory has inched a step closer, with the discovery of a way to recreate a crucial developmental step in a dish 1. “Epigenetic ...

Researchers are inching closer to creating human eggs and sperm in the lab that carry a full complement of anyone's DNA. It could revolutionize fertility treatment and raises huge ethical questions.

Scientists have spent decades studying the extraordinary abilities and anatomy of human sperm, ... Pregnancy & Birth Man gets sperm-making stem cell transplant in first-of-its-kind procedure.

Stem cell biologist Jacob Hanna, a member of the 2024 #STATUSList, predicts human embryo models could pave the way to organ transplants.

There are up to 750 million sperm cells contained in a single ejaculation, but it only takes one sperm cell to fertilize a woman’s egg. The testes also produce the hormone testosterone, which is ...