The first few weeks of an embryo's development are vital. Now, new techniques are allowing scientists to learn more about this crucial time than ever before. Read more: https://www.nature.com/articles/d4158… Sign up for the Nature Briefing: An essential round-up of science news, opinion and analysis, free in your inbox every weekday. https://go.nature.com/371OcVF
Building a baby: The first two weeks
