Lab grown models of embryos, made from clusters of stem cells, are getting increasingly complex. Ethicists, regulators and legal specialists are scrambling to keep up with the pace of research.

Lab-engineered human embryo models created from stem cells provide a look at development beyond the first week. But they raise ethical questions.

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 ...

Pictures by LIFE magazine photographers paying tribute to the artist at work, and the simple, beautiful human form -- the artist's muse.

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 ...

A team of scientists have successfully created authentic models of a human embryo using stem cells, and successfully grown them outside of a womb until key embryonic features such as a yolk sac ...

Four teams have coaxed human stem cells to organize themselves into embryo-like forms. The advance could shed light on fertility.

The new models derived from human stem cells do not have a brain or beating heart, but they include cells that would typically go on to form the embryo, placenta and yolk sac, and develop to form ...

Honoring the Human Form, a new art exhibit with about 70 pieces at the Schwartzkopf Gallery in Cedar Rapids' Cherry Building, explores the human body through seven artist's unique perspectives ...