Special Issue | 6 June 2013Mysteries of Development
Despite new methods to probe the development of an animal or plant from a single cell, biologists have much to learn. The mysteries offered here are a humbling reminder that our knowledge of this unimaginably complex process remains to a great extent embryonic.
More from the Mysteries Series:

Mysteries of the Cell
We live in the golden age of genetics, but the fundamental unit of biology is still arguably the cell. Scientists at the 2011 American Society for Cell Biology's annual meeting detailed their latest insights and data.