"Developmental biology: The hole picture"
What's the best way to make a tube? Roll up a sheet? Hollow out a solid rod? Some innovative movies show how the problem is tackled during the development of blood vessels in embryos. Check out this incredibly cool movie from the journal Nature's web site that actually shows the formation of blood vessel structures from the merging of bubbles.
Keith Mostov and Fernando Martin-Belmonte are the authors of the article from the July 27th 2006 Issue of Nature on page 363.