image: X-ray crystal structure of a molecular knot with eight crossings. This material relates to a paper that appeared in the Jan. 13, 2017, issue of Science, published by AAAS. The paper, by J.J. Danon at University of Manchester in Manchester, UK, and colleagues was titled, "Braiding a molecular knot with eight crossings." view more
Credit: Jean-Francois Lemonnier, University of Manchester