New research suggests DNA may not need activation, challenging a long-held idea about how life began and reshaping ...

Around eight days after fertilization, the human embryo implants in the endometrium (the tissue that lines the uterus). After implantation, it enters a developmental phase that is not well understood ...

You can’t make a mammal-ette without laying some eggs. The duck-billed platypus wasn’t the only mammal to lay eggs. Analysis of a fossil in South Africa proves that our mammalian ancestors were ...

Biologists have provided new insights on a longstanding puzzle in biology: How complex organisms arise from a single fertilized cell. Producing a new 'gene atlas' with 4-D imaging, the researchers ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. What do the earliest stages of a pregnancy look like? Embryonic development has been extensively studied, but most of our ...

Over half of our genomes consists of thousands of remnants of ancient viral DNA, known as transposable elements, which are widespread across the tree of life. Once dismissed as the "dark side" of the ...

Eating large amounts of ultra-processed food (UPF) is linked not only to reduced fertility in men, but also to slower growth ...

Eating large amounts of ultra-processed food (UPF) is linked not only to reduced fertility in men, but also to slower growth in early embryos, and smaller yolk sacs, which are essential for early ...

A new study suggests higher ultra-processed food intake may be linked to poorer fertility outcomes in men and subtle changes ...

Embryo transfer (ET) is the final step in in vitro fertilization (IVF) treatment. Beyond embryo quality and endometrial ...

Proposal for embedded ethics, based on dynamic dialogue, to facilitate ethically responsible research with stem-cell-based embryo models.