The first steps of human development—those that occur within the first few weeks of pregnancy—remain mysterious in many ways. Within a week of fertilization, human embryos form a blastocyst, which ...

Scientists have created hollow spheres of cells that resemble human embryos in their earliest stages of development. The artificial embryos, called "blastoids," could allow scientists to study early ...

Researchers that study in vitro fertilization, human development and the diseases that may arise during that time, and miscarriages face a lot of challenges in investigating the biology underlying ...

To better understand the earliest stages of human growth, researchers can examine donated embryos or human embryonic stem cells, both of which are in limited supply, or address their questions with ...

The study of early human development has been hindered by technical difficulties and the limited availability of embryonic material for research. The blastocyst is a key developmental stage that ...

The creation of cellular structures similar to blastocysts has enabled KAUST scientists to build an in vitro model that mimics the earliest moments of human embryogenesis. A blastocyst is the first ...

Researchers have very limited opportunities to study the earliest stages of human development, but a groundbreaking discovery led by a team in Australia will now provide them with a valuable new model ...

The earliest moments of human development—between the time of fertilization and when the embryo implants in the womb—have remained opaque to scientists. Cells in the earliest stages of human ...

In some mammals, the timing of the normally continuous embryonic development can be altered to improve the chances of survival for both the embryo and the mother. This mechanism to temporarily slow ...

New "models" of early human embryos that cannot grow into full human beings provoke ethical questions about whether they are human beings. One ethicist warns that research should be halted out of ...

Living structures that model early human embryonic development have been generated entirely from cells in the skin. The models mean it should be possible to study infertility, early miscarriage and ...