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 ...

Fluorescence microscopy reveals patterns of nuclear division in a parasitic fly embryo (Ormia ochracea) within this insect's extraordinary  'uterus'.

Studying human embryos after 14 days of development could be illuminating, but ethical questions abound.

Embryo models are getting remarkably realistic.The little clump of cells looked almost like a human embryo. Created from stem cells, without eggs, sperm, or a womb, the embryo model had a yolk sac ...

The cells generated by the very first division of the fertilized egg make a lopsided contribution to the body’s organs and tissues.

Did you know this photo by Lennart Nilsson was staged? Neither did we, until we read the University of Cambridge’s online exhibit, “Making Visible Embryos.” Although claiming to show the ...

Human embryos are more muscle-bound than adult humans, new microscope images cataloging early development show. For instance, at seven weeks of gestation, embryonic hands have about 30 muscles.

Scientists have created a mouse embryo that’s part human – 4% to be exact. The hybrid is what scientists call a human-animal chimera, a single organism that’s made up of two different sets ...

SNEAK PEEK At 9.5 weeks of pregnancy, a human embryo is almost 16 millimeters long — about the size of a 1-cent euro coin. A new 3-D tool lets users check out (from left) the embryo’s skin ...

The Vatican on Friday condemned the cloning of human embryos, calling it the "worst type of exploitation of the human being." ...

If scientists could watch an embryo’s cells develop in real time, they might be able to understand, track, and ultimately prevent, the formation of mutations and diseases in human infants ...